You've heard of me... You don't know me

so i have an interview for the ICA on tuesday at 4, and everytime i think about tem i get upset, i get nervous, i get scared. and interview is supposed to be an oppurtunity to get to know the person being interviews, What if im too complex they cant get to know me in jsut 15 minutes... what if i cant sell myself for who i really am... what id they dont like me... in interviews the point is so peopel cna see how you carry yourself, how you present yourself, and how you interact in any day society...