What can i do about this. i feel so bad and i cant get over her? :( please help..?

okay so i was asked to be in this girls 15 thing.. anyway i got my partner i liked her i would tease her and she would tease back and stuff. but the day before the party she was being a ***** to me.like telling me to shut up and stuff. and on the day she would talk to my friend sitting next to her. he would like try not to talk to her cause he liked this other girl. anyway she basically had her back to me in the limo so i move next to this other girl she would laugh and we would flirt and stuff. and my partner would look jealous and stuff. so anyway we get to the party and shiz she starts talking to me a little more and then before. so i was planing to make a move grow some ask her out. but she leaves early so i didn't get a chance too. i tried texting her and talking to her on FB but she doesn't reply.. all week i haven't shaved i don't care about anything im in sweats all the time. i cant really get out cause my friends live Pretty far from me. and as i was starting to get over it a little i have a dream that me and her were back in practice and everyone left she tells me she likes me alot we made out... it all seemed so real.. this is getting so blah... help?... sorry for this being so long... thanks for all answers... :)