Hopefully, someone on this site can help me out here.

Very recently, a very sensitive situation occurred with my sister. A man who was supposed to be respected masseuse, attempted to massage her, “ovaries" as he put it. She didn't let it happen. The fact that he tried was sick and my sister has had to go through this as a child. So it hurt her beyond words. She's 29yrs old. When she got in the car with me, she told me what he had tried as we waited for our parents to finish what they were doing. I'm her younger brother, 19yrs old, and I sat there with just pure anger, rage and just hate. I wanted this man to pay. But I sat there and did nothing. Every fiber said do something but I knew what the repercussions would have been had I.

That very night, when we finally got home, my mother had gone to go talk to her. So I went for a walk and a smoke to just clear my head but I couldn't. As I'm arriving home, my girlfriend calls, she knew that I was upset but I told her that I will call her back when I get inside and tell her what happened. She said okay, That she promises when We talk she'll be there for me to let it out, just to contact her on Xbox live cause her phone was about to die. I go inside and check on my sister and talk to her for a bit, I apologized to her for just sitting there and did nothing. She said it was fine. That she wasn't angry at me. My mother returns into the room and my sisters asks me if she can talk to my mom alone. So I leave the room and head to mine.
I get on live to talk to her, I send her an invite (if you're not familiar with Xbox live, it's just a way for people to get together via the Internet and play video games with everyone around the U.S. An invite is the way to start a conversation with just someone you know). I'm still angry. and very impatient at that point. So I wait for 5mins since she's in another party. I just get off. A bit later my sister asks me if I wanted to hang out with her and watch a movie on Netflix. So I join my sister. My girlfriend calls my phone here 3 times here and there. Sent me text messages she doesn't be in that party. Like "damn it... ", "I don't want to be in here". I just ignore her. I'm just upset and rather not take it out on her. So after a couple of drinks with my sister.( Yes I realize I'm underage and it's wrong but please for some of you who wish to just criticize about how it's wrong of my family to have let me have a couple of drinks. I very kindly am asking you to refrain from it. I'm here for advice and help.)

I didn't have many, about 4 beers. My sister tells me he's going to bed. So I tell her goodnight and walk to my room.

A bit off topic. But I am a very laid back, easy going kind of person. I do not get upset easily at all. So other than my family, no one has ever seen me truly be mad. As a child, I did deal with many things and growing up. But even close as severe as my sister's childhood. So since I was young, I have always bottled up my emotions, and it's horrible to say but I am very good at doing it. One must do something extremely horrible to me if you are to get even a stir from me. But no one has seen ever seen me in that state. I am very different from many others when I'm just in pure rage. I don't yell and I don't throw things around. I'm very calm, like the eye of a hurricane, my emotions completely shut down, and if I feel like a person has done wrong to me in the past or do something that just bothers me(which at that point is just about everything) I push the right buttons to hurt that person, I point things out, dissect it and it's a bit difficult to explain but the best way I can is that I manipulate a point to where the person I'm talking to believes what I'm saying is true. In a way it's true and it is not at the same time.

What happened to my sister is just one of those very few things that let's my anger come out.

So I'm on live just waiting on my girlfriend. Thinking like anyone who is with someone, that they can count on that person the most other than your family.

But I'm just waiting as she still is in that chat party. And that just set my anger on her. When I know someone is upset or something is wrong, let it be my girlfriend, or one my friends. I drop whatever I am doing, tell everyone to leave me alone and help that individual out. But no, with her I'm waiting. She's complaining that she wants to get out. But she is one of those types of girls that don't like to be rude or be mean. So I just send her a message telling her that she is clearly not leaving that party any time soon so I'll talk to her later. No more than 30secs after I sent that message. She sends me an invite.

I can't remember much of what I told her. But from I can remember I just told her that I felt that her love wasn't true, that I will always come before everyone and that she didn't care about me as she claims. She just told me she had to go after a while.

I later talked to my girlfriend and apologized to her. To not believe what I said was true. What I did wasn't right but I was just upset. And that is the worst of me, but that's only me in a very rare blue moon. It takes something that happened  to my sister to get me angry.

But I sit here, still with that lingering feeling of anger. At my girlfriend, at myself. I know what I told her wasn't true. But I don't feel wrong in saying that I believe that she puts everyone before me. Her reasoning was that at some point in that chat her and an old friend that just recently started talking.(he's a mutual friend but she has known him since middle school) that he started to cry because they talked about middle school and it saddened him that it's over. Call me selfish, call me wrong. I don't ever ask for help, I don't ever ask for her to be there for me, at all, maybe twice a year. But I don't care, I don't feel that surpassed what I was going through. Maybe it's because I'm angry but I feel that if she wasn't going to be there for me like I am for her. That other person better have a far worse situation if she helps them. I understand her nature, ****, I'm the same. And any other time I encourage her to stop talking to me and help that other person. I just feel like the time when I really would like her to be there for me, someone crying over the good days of middle school doesn't cut it.

My question is what I do. I'm still so angry for just sitting there for my sister and not doing anything. I'm still angry at my girlfriend because a middle school story surpasses me.
I'm just still angry.
And I'm trying so hard to not to show it. And I know I'm wrong but I'm just forcing myself to bottle this up.
So please any advice, any comment, anything would be very helpful.

Thank you.

You get over your anger, and not take it out on others, and not make it an excuse for bad behavior at all. Seems your sister is handling things better than you. Get yourself under control.

Actions, and decisions made in anger seldom turn out well. Especially when it lingers. Give the girl friend a break.

You didn't respond to your girlfriend's attempts to contact you because you were spending time with your sister. She didn't get back to you right away because she was talking to an old friend. Call it even. Sure your situation may have been more serious, but how was she to know that?

A great way to help yourself deal with the situation that occurred with your sister would be to look into some volunteer work at a woman's shelter, or some other worthwhile establishment. You can't go back and change what happened, but you can reach out and make a difference for someone else who is going through, or may have gone through, a difficult situation. It can give you a sense of being able to do something.

You could also, if possible, look into filing a complaint with the business that this man works at. However, massaging the abdomen, often does include over the ovaries. I don't know what type of massage she was having, what sort of establishment it was, whether this was a regular part of this man's technique, or if he did indeed cross the line.