HELP!!! i need a girls help for this one?!?

ok so im in 8th grade and our graduation is coming up. im a tomboy so i hate high heels and dresses and all that stuff. my friends and i are going dress trying on and high heel practicing at the mall. i HAVE never worn high heels and im a klutz. even in 5th grade during graduation i wore PLATFORMS and i tripped...it was soooooooo embarring. i really need help before grad. or else i will kill myself trying to walk.... HELP!!!!!!