I think we all have regrets of some sort BUT you only get one shot at this life so enjoy what you can from it, Iregret wasting giving time, money and any scrap of emotion to a couple of people, my life has changed dramatically over the last few years but i'm now happier than i have been despite less money, smaller house etc etc, as you get older you realise your partner, family, great friends and lifestyle are all you need..........
Best not to dwell on regrets, you can't change it, i have my kids, partner, some great friends, my dogs and touch wood my health, anything else is a bonus