If I could talk to my younger self I would say: "All of the things that you care about are completely meaningless. The school assignments, girls, money for the weekend...none of it matters, not even a little bit. Gather knowledge on how to make things that help people. Start now and never stop." This question leads to another...why don't people tell these things to their kids? "You don't have to wait to grow up to do…
The rest is directly countered by teachers and classmates in public school. You're told you can't do things until you're older, and mistakes and differences are punished.