Pretty much everything. Sure, there were rules like going to bed early, asking to go outside, eating everything on my plate. But what I miss is the fact that I didn't have to worry about much then. I didn't have to worry about money, where I'm going to live, if I'd ever find 'The One', my friends, I had more friends as a kid than I do now. I still have friends, just not as many now.
Not having to work
Homework was easy
Not having to drive or learn to do so
Being able to hang out with friends more often
People were nicer as kids a lot of the time
Not having to stress about anything
No chores
The list is endless for me
Just . . . Everything. The innocence, not having to worry about the problems you do now, almost always being accepted by people your own age, having imaginary friends, playing make-believe games, always being loved on, watching and doing all that childish stuff without it being weird, . . . Why can't I just go back in time and be a kid again?! ;-;