Am I being to sensitive?

[nora]

I don't think anybody here actually knows me or anything, but I don't know where else to go.
So I am a 15 year old girl that has everything that a person could possibly want, (except for a social life.): nice parents, good school, good upbringing, etc. Basically I have this group of "friends" but they only act friendly when I'm around the guy I like (there's the guy, about seven girls, and some other guys). And they all know I like him, he likes me, because he asked me out to homecoming. But whenever we're together, these same five or six girls manage to flock over to me. (They NEVER do that when I'm just sitting alone). And it's usually the same two, three girls that try to get his attention and act really "friendly" towards me. But when I'm alone, I might say hi and they completely ignore me (not even a little acknowledgement that I exist D. For instance, there's this specific girl that does this a lot.. When we go to places as a group, she takes a ton of pictures of specifically him (as seen on facebook). Then it's almost as if she's flirting which really bothers me She's also called me a dumb b**** in my face. And some of the other "friends" do this too. This is pretty much the same with my other friends too. They come to me with problems, and I'm not trying to deny their right to complaining or anything, and I listen/try to be interested; then give advice. However, when it's the other way around, they just blow me off like it's no big deal. It really hurts my feelings and I'm starting to think that maybe I'm being to sensitive? Or maybe I'm taking all of this too personally? Please help I feel like anymore of this and I might stab myself. I really just want to disappear.
(I'm sorry if this seems like whining or just com complaining, but I feel like I have a serious problem...)