I AM SOOO JEALOUS: CARE TO HEAR MY STORY?

Theres a girl in my class whom i shall not name so lets just call her Person. Soo she always copies me like 4 example: when i use mascara and lipgloss and put my hair in a ponytail, she comes back tomorrow with the same thing: only WAY better and every1 compliments her and stuff. and then, she always pretends to be my bff but always says stuff like "What happened to YOU?" Or maybe "Nobody cares!" and she tries to steal my best friend from me. all the boys ask her out and i get mad when she brags about it uhhh. anyway, one day i asked her to sing a song with me in front of the class. her parents are singers so her voice is REALLY angelic and beautiful (i hate to admit). so the following day, the day which we were gonna sing, she came back to school like a BARBIE, too pretty to be real: glossy, long, shiny, blonde, curled hair, and hot pink lipgloss, dark mascara, and a mini-skirt. (and dont forget that it adds to the great voice), sooo basically she made me look ugly and stupid next to her when we sang. and everyone praised her and stuff and she shined even MORE at the talent show when she was a superstar, sang alone in front of the whole school (4-8 grade) with her looks, charm, popularity, and voice. so now, i feel like a loser. she is always shining like a star, and here i am; frizzy hair and all. now what?? i dont know what to do about this perfect-at-everything and born-towin and born-to-run-everything brat. she may be an angel, but to me, she's just.. uhhhh. PLEASE HELP. TELL ME WHAT TO DO. ANYTHING HELPS!!!!! THANKS SOOO MUCH. :D <3