Having no regrets frees you from yourself. It starts with you forgiving yourself for choices made. I admit that there are some things I have done that were misguided and or stupid, but I’ve learnt from them. Personal growth is the opposite to regret.
It is when you don’t learn from what you have done in the past that you should start assessing things more deeply.

But I admit, if all else fails and you feel like hurling yourself from the nearest tall building, I know that “It’s better to regret something you have done than something you haven’t”. Otherwise you would never have known the consequence.