Well in my experience I would say that we can be all experience some low key in our lives. But that doesn't mean we will not be making ourselves more better. I would suggest those who want to quit to think many times before deciding that crucial decision.
yes, regret changing yourself will be better because regret makes you an experienced person. regret is of no use, so why regret what happened. avoid careful regret in making choices and actions because it can make you regret even though it is trivial.