If you're new, you can start out fresh as someone that nobody knows about. Go up and just say hello to someone. It may feel awkward or hard, but people appreciate having new people come up and say "hi". It makes them know you noticed them and people enjoy being noticed.
Just talk to people that sit next to you in class starting off with little stuff like about the class work. I suggest getting into summer school if you need the credits or not to get the feel of the school and maybe a couple friends before the actual school year