Girl trouble... pelase help ( desprate)?

theres this girl...... she says im sweet im nice im forgiving and all that nice stuff a girl likes about a guy....... but wen i ask her out to my skool dance she says no. i tink its cus im not "hot" enuff 4 her..... now im all pissed.... and i hate me wen she makes me love her..... so then i dont talk 2 her anymore......... then now everytime she sees me she crys..... wat shld i do..... helps!!!