The girl I lost it to had done more than me, it doesn't really matter in my opinion, have you had sex with her?

Your first mistake was asking her that. Every guy knows their gf has had sexual relations, but guys want to think that their gf's are fresh and clean, and that they are the first guy ever to be in that. The only way to get past it is to just let it go.

As already said, you just have to let it go. Like you said, it's a lot to accept, but everyone does things in their lives sexually, and to think that she didn't is a bit naive.

It's good you don't see her differently, because just the fact that she's done some sexual stuff in her past doesn't change who she is. I believe that in time, you will be able to ignore this. Right now it's stuck in your mind because you didn't expect it, and it's such a shock. You're still in that shock a little bit, but it'll wear off eventually.

I hope this helped a little bit there.

Edit: Okay nevermind then lol

are you jealous?
well you can't do much about it, so accept it. i know guys are sometimes really protective, and that subjects pretty touchy. just try to move past it.