Feeling Alone: Drifting Away from Friends

I feel like I'm drifting away from all my friends. I don't know why we just have gradually stopped talking as much. Maybe because of school but I hate it and I don't know what to do I just feel really alone because they have alot of friends and I'm just kind of there. I want things back to normal and I kinda just wanted to rant somewhere so ya. is there any way I can do anything to stop it? I feel like we're growing apart because we're growing up and not in as many classes together anymore but we used to talk everyday and now we barely do.