You can't live your whole life without making a single mistake. You also can not live life without atleast having one regret. Regret is a part of life. But it's not meant to be lived with forever. Maybe you think about a poor decision or decisions you've made as a teen or even later in life. Get out of the habit of dwelling and rather develop the habit of learning. Reframe from beating yourself up over things that you have no control over. Just focus on not making the same mistake(s) over again. Create a new and more positive scene in the movie of your life. Tune in to hear some choices you should take to help overcome regret.