Problems, weaknesses, setbacks, regrets and mistakes teach you if you're willing to learn, or they punish you if you're not.
Do what is right, and you'll have no lasting regrets. Do what is right, and put yourself on the side of truth, goodness, and the best of life.
You are full of wonderful possibilities. Do something with them. The most painful regrets, those which never go away, are regrets of things not done, things never attempted.