Are your biggest regrets things you have done or things you have said?
James 3:5 “So also the tongue is a small part of the body, and yet it boasts of great things. See how great a forest is set ablaze by such a small fire!”
If I had a nickel for everything I have said that I would like to take back, I would be a wealthy man. Words are like bullets. Once you have fired them, there is no way to change what they have done. You can be sorry and try to repair the damage, but what has been done by them, has been done by them.