ACTORS , ACTRESSESS , PERFORMING ARTS STUDENTS ?!?

Hi (: I'm going to be a freshman in high school and i'm working REALLY hard on starting to get a really impressive high school resume for my college applications . I'm more interested in getting an athletic scholarship to oklahoma or texas at austin but what i've recently been extremely interested in for some reason is getting into Juilliard . I've been in programs for performing arts so i'm no oblivious to the art but i was wondering from anyone who goes to a performing arts school or maybe even a student at juilliard or a school like it to give me advice on what to work on and focus on before i fill out my application senior year . i've signed up for drama all through high school but i know thats not going to cut it . i'm applying for acting . i've been in plays in a community theater and i can sing too . dancing really isn't my thing though , could this affect me ?! please help ! thanks :D