Post graduation stress

i’m really just stressing about the life ahead of me. i just graduated highschool in a town of about 5000 people and the thought of everyone leaving to go live separate lives is so depressing. i was talking to this girl that i’m interested in and she’s leaving in about a year, i’m happy that she’s going to live her life but it just hurts to know that it’ll probably be without me. not sure what kind of answers i’m looking for, maybe just your personal stories or advice. thanks :)