I would go back to 2012, when my friend asked if we should get some bitcoins. Then slap my past self for telling him that it was a silly idea.
Would also go back to 2010 and tell myself that things get better! I got severely sick for a few months which affected my grades for a while, went from doing very well to way below average. Felt very frustrated at the time that my best effort wasn’t producing results.
TLDR: Life can be hard, but don’t stop moving forwards.
Great question! I think job wise I would probably go and tell myself to pay more attention in biology earlier on – it is pretty cool the human body and it took me a while to realise that.
Otherwise I would tell myself there is this great sport called canoe polo and I should try it because it suits me very much.