I'm 18 and graduated high school 4 months ago. That day I didn't realize how different everything would be, but now I do.
My best friend is hours away at college. I see her once a month if I'm lucky. If I had realized it'd be like this I would have taken advantage of every sleepover, shopping trip, study session, movie night, and girls' night.
You don't realize how much you need your best friend until you need someone to talk to and you realize there isn't anyone there. She's just a call or a text away, but it's not the same. She can't drive over to my house if I need her, she can't ooVoo on the spot if I need a vent sesh, and she's not here to pick up the pieces when things aren't going so well.
Take advantage of every day you have with your best friend because one day you'll be desperate for the days you took for granted.