It does no good to regret things, if you like who you are.

To regret something is to wish change upon yourself. If you learn from your mistakes, anything you would regret has only made you stronger. If nothing else, you learned never to do that something ever again—which you would have no way of knowing if it had never happened.

To wish something undone is to open yourself up to repeating the mistakes of your past.

And the next time, you might not get anything out of it.