Who says you have to stop being a kid?

It certainly does not have to end at 17, and it certainly does not happen suddenly or when you graduate.

Try never to stop enjoying life, there is always room for fun and games, and there should always be time to 'get out and do stuff'. I know someone tried to show you that recently, but you took the 'stay in and do nothing' choice mostly.

It's your life, enjoy it!!

;-)