You know how they say that girls or boys, want what they can't have. It is very True! But for girls, mostly teenagers. But like the other dude said lose this girl. Because you can't compete agains someone who's 2years older then you. And no girls are dream girls when your in high school, these girls changes personality more often then they change underwear! so dream girl today, might not be tomorrow. but getting over her, its really f'ing hard in the begining, but give it 2-3weeks max. but during that time, start looking for new "conquests"! and us your Boy friends. one of the few things that are true from hollywood, teenage girls, like popular boys!
PS. I am a noobie myself, so do not take what i say 100% serious. I might be wrong, but try it out.