A lot of people when asked "What would you do if you could go back in time?" talk about doing something that would stop a "very important" historical event (i.e. Kill Hitler as a baby, warn the POTUS about the attack on Pearl Harbor, stop the assassination of JFK, etc.)  I always think about going back to my teenage self and tell him about all the time/energy/money he is going to waste as an adult.  "Don't Do It! Just Don't Do It!"  LOL!!!

I've said this before in my Captain's Log. If I could go back in time, I wouldn't kill Hitler as a baby. I'd try to change the environment he grew up in so he never became a tyrant in the first place. I just don't believe violence solves life's problems.

On a personal level, more like Back to the Future than world history, I'd tell my younger self that chasing money, shiny toys, and the wrong crowd isn't worth it. What really matters are family and close relationships. In the end, nobody lies on their deathbed wishing for one more car or one more late night at the office. Those truths only sink in later in life, when you realize what was important all along.

Oh and I'd tell myself: Buy MSFT, GOOG, and Bitcoin - and make sure to sell it in 2025 (yeah, I think it's peaked).