long distance

okay so I met my boyfriend about 10 months ago and we're about to make 8 months dating on Friday. I just took him to college 4 hours away from me and it has got to be the hardest thing I've ever done I'm still a senior in high school so I'm gonna be doing my thing and he's gonna be doing his. I know he loves me and won't let anything happen I just don't know how long distance relationships work and I really need some help so I can stop being so sad