i regret never finishing collage despite a high GPA. I also regret the way I treated my childhood friends as a kid, or many for that matter, that time was so precious and I blew it and will spend the rest of my life pondering what would be different had I been nicer and more cooperative. I was mean and self centered, and payed the price for it. 
_________________
DX'ed with HFA as a child. However this was in 1987 and I am certain had I been DX'ed a few years later I would have been DX'ed with AS instead.