My girlfriend found out about me being with other men sometimes, she is upset and don't understand it and what to do about it, it really messed her up, I would like to stay with her and live normally but she doesn't know how to handle it, I want to help her,, or is it too late

Live 'normally'?

In any relationship, there is the matter of trust. In your case you are cheating on her, regardless of whom you are cheating with.

It sounds to me (and I'm no expert) that you need to figure out what is important to you and who you are. It is entirely possible that you are gay and cannot have a 'normal' relationship with a woman.

Number one is to learn that you can't have your cake and eat it too. I'll bet you are extremely young. With emotional maturity comes the ability to learn that the world doesn't revolve around you, your immediate wants and that actions have consequences.

Consider this your first lesson.

Whatever you do, just follow your heart + any rule and norm in there
Maybe you could answer what you mean by "live normally"

Don't have sex with a woman if you have sex with men... be a stand-up guy. No reason to get aids or hiv and spread it to a woman.

You should all get tested for STDs. You should be ashamed of yourself. If you are lucky, she will forgive you. Make sure she knows you are sorry.

You have to pick one. Either be in a relationship with your girlfriend, be faithful, or break up with her and jump from bed to bed with other people.

I don't think she's as upset about you being bi as she is that you cheated on her.

It's time to pick, and stick with that choice.

Will she forgive you? Only she can decide that, but if you earn back her trust, you better not break it again.

Good luck.