Let's say you would go back to when you were 12-14 years old. What would you tell yourself ?

Let's say you would go back to when you were 12-14 years old. What would you tell yourself ?
Spend the few first seconds to explain to him that I'm basically him in the future, then try to list all the bad events and mistakes that happened so that he can avoid them.
Instruct my self to invest everything into Bitcoin when it comes out, and sell when it hits 50k
This !
Double this!
List the stocks to invest in, like buy all the Amazon shares that you can afford in 2012
To be more self confident !
To start a youtube channel
To focus on english more