I dont want to hang with friends anymore.?

School is out for summer and everyone is back home from far and wide colleges. Now I would initially expect some awkwardness being that I am not as close to friends as in high school. However I feel the situation is never improving. I consistently feel isolated by my old friends. Is there something Im doing? Anyway I do not wanna hang with my friends anymore for the rest of summer. What should I do because I still want to have fun/ go to parties and stuff?