Wow! A lot of mine are the same as yours!
I would have found fitness/health earlier. 18 and over 200lbs is no place to be. Canned lemonade and Ho-Ho's do not make lunch. A PB sandwich on white bread and a huge bowl of ice cream do not make an afternoon snack!
I wouldn't have quit college. I was pre-med. Shouldn't have quit, but I had a lot of family stuff going at the time. However, in all that I married DH and had DS, so I can't say its a complete regret. Who know what would have happened if I spent another 10 yrs in school?
I would keep in touch w/ old friends. I have a very hard time doing that, and I often wonder what they are up to. All I need to do is pick up the phone, write a letter, or send an email, yet I don't do it.
But, we can't regret what we've done bc we can't change the past, and have to work with what we have now. I'm happy where I am now, and who's to say that making any of those other choices would have made me happy. Can't change it now, so just keep on movin' forward!
Nan