Hitting me hard

The future is really hitting me hard. I just can't believe that I am ending a huge part of my life in a few short weeks. Its not that I'm scared of college, its just that I don't want to lose all of my friends. I have become good friends with some people that are sophomores and juniors. I am really sad because I want to spend more time with those people and I don't want to lose contact with these people. Has anyone ever felt like I do right now? Who did you lose? Was it from a big life change, like moving? Anyone have any advice how I can not lose contact with those I care for?