My girlfriend gets hit on by a lot of guys everywhere she goes...Should I worry?

It usually feels nice to be hit on, it's like a compliment...so that's probably why she teased you about it a little bit. It sounds like you and her have a really strong, understanding relationship. My bf and I have the same thing. We both get hit on now and then, and all we have to do is laugh it off and tease the other about it. We know neither one of us are "going" anywhere. We love each other, and no one else. The best thing you can do is try not to sweat it, or get territorial and pissed off about it...that is only going to upset her, and make her feel trapped and like you are treating her like property. Remember the saying "if you love something, let it go." that just means, trust her, let her be herself, and it sounds like everything is going to work out.