Lonely summer

Currently on summer break from high school and I feel alone. It was the same last year after I have a very good time with friends at school during the year and then in the summer I just have no one to be with. I made a lot of new friends this year but now I haven’t met or talked with them in about a month and I just don’t know what to do to. I usually spent a lot of time with them at school but outside of school I don’t really talk with them except for one or two of them, most of the time it’s fine because I meet them at school everyday but during long breaks I just don’t have anyone to be with or talk with.