Nervous about the first day???...FRESHMAN!?

Hi, I'm going into a public high school as a Freshman this year, and I am honestly really nervous! It's my first time in public school, and it's the biggest school I have ever been in...ever! I think my personality is fine, I'm usually pretty social...for sure, but I dunno...I am also worried abut getting cl to cl, because in my old schools, you just had cles, you didn't have to get to them... I don't really know if I'm more nervous socially or academically...help? any tips? oh, also, would you wear a dress to school (sundress, how would you accessorize (I'm from machusetts, so it gets coldish))