I used to want to be older when I was younger. I'm 21 now and hell who cares anymore. You have a LONG life ahead of you. I do too. I think it's all up to what you do on a daily basis. I mean if your working 12 hours a day going home then sleeping the other 12 and doing absolutely nothing in your life then your wasting it. Humans can live a LONG time, but wasting it is wasting it. Don't start bad habits and have fun everyday is how I see it. Doesn't mean go parties everyday just do what you like to do. Spend time with the GF or start a new tank up...ANYTHING.
You shouldn't be wanting years back when your 18 dude. lol I know I don't. I had good times when I was younger but you literally have your whole life ahead of you.It gets better. Being 18 or around there sucks. You graduate soon then have to go to college, parents kick you out, or you want to move you but you can't afford a place of your own. It'll get better. lol