I'm 17, have been since early August... But now all my irl friends are turning 18 and having loads of birthday parties at bars so I can't go- some of them aren't but the majority are and keep inviting me, then they get all annoyed that I can't join them, but I'll be able to enjoy my 18th with all of them next year! (Not like I'm stealing all their ideas to have a super-amazing 18th Birthday Party!)
You get people like that no matter how old you are. That's just how they're always going to be. ;; It might seem like the majority of people you know are like that, but so what? As long as you keep yourself to yourself and they aren't bothering you, then I don't see much wrong with it, even though I know it can be kind of annoying since I know girls like that too. xD