High School next year... help!?

So I'm going into high school next year and I am freaking out! First of all on 4'8 so I'm like a punny bug compared to all of the freaking gorillas that I know are there And its scaring me. I've been to the school about 10 times cause I do colorguard but I'm not really familiar with the school. Any advice about what to do. Fitting in... blah blah