I don’t really regret anything in my life. Most of my life has not been in my control. If you don’t have control of the things you want or need and you don’t get them, regret isn’t the word I would use to describe that situation.
This song does a reasonable job of summing things up. Chance. I’m not saying life is just a game of statistics, but you can’t win if you don’t play. If you do play, at least make sure you have a strategy first.