I just find out that my girlfriend not a virgin anymore she never told it to me. She said I'm her first but I found out from my friend that something happened between them before we start dating. It was her first and she said she was forced. I don't know how to feel right now. I'm starting to love her and seeing the future with her. I don't even know how to deal with my friend. We see each other often.

The problem is not that she isn't a virgin. If she had relationships before you, that's her business and shouldn't matter to you.

The problem is more that she lied about it. But I would cut her some slack here (how old are you both). I suspect, that you made a big deal of this and actually asked her and she was afraid of losing you so she lied.

You need to discuss the dishonesty frankly and openly

Same problem with my girlfriend, and I'm still with her to this day. Scott nailed the head on that one, she was afraid of losing me. Talk with her about it, but be careful about the tone in which you approach it.