OK, so a while back ago there was a guy who I didn't know that had the same last name,
My last name is kind of unique but I was told there are other familys out there w/ the same last name.

B4 I found out this info I told him he was cute, and I had a crush on him a little,
He was cool with it and didn't freak out like some guys.
I then later found out that we had the same last name and after finding this out
My little crush, was no more, not going to risk it. I even told him that.

I asked him if he knew about us having the same last name and he had no clue until I told him and his older brother confirmed that we all had the same last name.

Know IDK if we are really related or not, I don't think we are and I asked a family member and she didn't know for sure or not, but said she didn't think so.

So a couple of months later after find this out we were hanging out and he just kissed me,
I had no idea how to react and I haven't really been kissed before or even have had a BF, and it freaked me out! (and no I didn't kiss him back).
That and I was upset that after knowing this that he still went and did what he did.
I even told him that I was weird out and that I didn't have feeling for him, he was like OK whatever but he's had been a jerk afterwards.
Now I've been weird out ever since and haven't really talked since.

The guy and I don't talk very much but I do see him around and worry
~If I do get into a relationship~ w/ a guy in the future, that he might go and tell whoever about what happened.
That and some of his friends/mine even knew about the kiss,
My friends haven't talked about it or as far as I know. IDK about him or his friends¦.

Now what I want to know how should I feel about this?
I mean has this ever happen to anyone else?

Also do I tell a future guy I might be in a relationship what happen/ or what happen if a guy asked about past kissing do I tell him? Or other people for that matter because I'm afraid of how people will react to this

You know your post is almost impossible to read and understand, some guy, who just happens to have the same last name as you, kissed you?? And if you are not cousins, which you are not, or you would know him, who cares, there would be nothing wrong at that level anyway.

Next if you are dating someone, why are you cheating on them by kissing someone else?

A "guy" does , at least one who has manners, does not ask a girl about her past boyfriends and what she has or has not done. You as you get older will find that a relationship is not built on the past but on what the two of the people build in that relationship.

I will assume you are more pre teen or early teen where all of this is new

Umm I'm more like 18 and I don't have a BF or have had a BF, and he kissed me , I never kissed back...

You are all worried about a guy who kissed you, who has the same last unusual name as you, and no relatives even have an idea if you are related or not?
That is NOTHING.
I live in an area with a lot of people who are related to just about everyone, if we go back far enough.
And yes, I have an unusual last name too, and we can't trace our families.
Sometime ask a math teacher to tell you how many of a name there would be in 5 generations if there are 3 male children in each (to carry the name) who each have 3 males. Take a guess!

Please do not ask the same question on multiple boards.

There is no reason to tell anyone anything. You have not done anything wrong though you seem intent on believing that you have.

Sometimes, what is a unique name in one place isn't in another. There seems to be nothing indicating that you are related unless it is very distantly. Don't let it worry you. Don't turn it into a scandal when it isn't.