If you were ever given the chance to start your life over with all the knowledge you currently have right now, would you? Of course you wouldn't be able to like use that knowledge to become rich or anything, but simply just start over.
No. My childhood was terrible and I don't want to live that again. You have limited power to do anything with that knowledge you have as a kid because many adults don't take kids seriously. Example:
Me: "I'm being bullied badly in school."
Adults: "You're just being a wimp. Deal with it."
Bullying is taken a bit more seriously now than it was when I was a kid in the 80s/90s, but if I was repeating life during the same timeframe I grew up, nothing would be different.