Honn.. maybe there were times you doubted your decisions. In fact, your decisions were indeed wrong. But what is the point thinking about wrong? Past is past and meant to be forgotten. If you don't want to live a miserable life, don't ever regret anything in life especially when making an option or deciding something. All you have to do is tell yourself to do better in future and promise not to repeat anything you don't like doing. You could weep silently or cry out loud, but don't ever regret nor blame others for your decisions. Always remind yourself... you are fully responsible for your own self. You be brave, trusts your good soul!