Relax, be yourself. It's a new year, a new adventure & it's time to meet new people & make more friends. People are just people so don't worry, you're as good or bad as anyone else. put yourself out there & enjoy it.
I'm sure everything will go back to normal. Have you kept in touch with your friends over the summer? Everyone will be nervous the first day of school. They will all be looking for familiar friendly faces.