Wait for the late 90s (I would have been in my late 20s) to start buying as much Apple stock as possible when they went almost bankrupt (yep, that Apple) and then retire barely a few years later, after I was able to purchase my own personal remote island with the fortune I would have made by selling those stocks? ;)
Or more realistically: don't be a dick with that sweet girl I loved so much who loved me too. I was young and very much ignorant but I ended up being a real dick nonetheless and I have always regretted it.