I was afraid of that too when I left school, especially because all of them went to the same uni, and I am in a different one. I only see them during holidays. But that is enough. Each of us have different experience, and when we finally meet up we have a lot to talk about.

Wherever you end up being you will meet new people, make new friends, live interesting life, and that's what makes seeing your old friends so precious. The important thing is not to loose touch with them, even if it's only in discord or whatsapp.