Why did we want to grow up so fast?

When we were a kid, all we wanted was to grow up. 
WHY? 
Juice becomes alcohol,
Candy becomes weed,
Wafer sticks becomes cigarettes,
Butter knifes becomes razor blades,
Scraped knees become slit wrist,
Death becomes a trend,
Goodbyes meant forever,
Love becomes complicated,
2 + 2 becomes 2x * (5 + 7) * 6 = 5x / 78,
Timeouts become expulsion/suspension,
Training bras become push-up bras
Footie pyjamas become lingerie,
Kisses become sex,
Bicycles become cars,
Society becomes messed up,
Everything seems impossible
Trust becomes non-existent,
Nice girls become sluts,
Nice guys become jerks,
Broken pencil become broken hearts,
Bickers becomes full-on fights,

Now tell me again, why when we were a kid, we wanted to grow up so fast? If I could, then I would turn back time to when I was a child again. If Neverland really existed, I would fly there and be like Peter Pan; staying young forever.