So here's the deal...
Imagine that someone invents a time machine that allows you to journey accurately to any point in tie & space that already exists - you can go back and forth as much as you like so long as you don't go forward beyond the point at which you started (plus whatever time may elapse while you're travelling) - so no sneaking off into the future!
What, in your own life, would you change?
What would you whisper into the ear of your younger self?
In my case :-
At age 12, "ask her, 'another time maybe?'"
At age 15, "don't be shy, never mind what others think, just kiss her"
At age 18, "tell her (about the cross dressing)"
Thoughts?