(An amazing person's amazing video: YOU DON'T HAVE TO GROW UP - Fads)
There are things you need to do in life.
You need to eat, drink, sleep, piss and shit.
There are things you DON'T have to do in life.
Get a particular job, have kids, go to university, or GROW UP.
You DON'T HAVE to grow up.
Stick to what you really like, the people you really like, the things you really like, stick to that. Don't doubt too much about it.
Take advantage of now because now is all there is.
Do what you love. Most adults don't like their job, so quit whatever it is you're doing that you don't like and, get a job doing something that you DO like.
If you get a job that you love,
You'll never get another day's work.