Towards the start of the school year, I felt the same. I simply talked to everyone and was spoken well of but I never seemed to be able to feel "in place". But as I socialized more, I met a few people who were really fun. So I simply started talking to them more, exchanging phone numbers, helping them out and whatnot. I started going to lunch with them as well. Soon, we formed our own friends group.
Also, towards the end of last school year, I started talking to a guy with whom I didnt talk to very much. But as we talked more, I realized how amazing he was and how we had so much in common. Now we're like best friends.So yeah, I think talking to everyone and getting to know them is a good start. Once you know who you really enjoy being with, just try talking to the more and hanging out with them. Sit with them if you have classes together and just talk to them. Also, talk to people you havent really spoken to yet. Who knows, maybe they'll turn out to be the best friends you could make!