Regret

You once said, "Never regret anything because at that time it was exactly what you wanted", but you're wrong. No, not wrong about it being what was wanted, but a person should always have regrets. If we don't regret things then we'll keep making the same stupid mistakes over and over because regretting the mistake is what makes us change our course.
You know the kinds of people who don't have regrets? Psychopaths. A psychopath can kill and kill and kill. Why? Because they have no remorse aka regrets.
Still think no regrets is a good thing? Learn to regret something. Change your course.