I don’t know if it is good or bad. I think it is personal to you.
Personally, in my experience, sure there are things I wish I could change BUT I wouldn’t change anything because everything happens for a reason. If I didn’t experience it then, I would probably have to experience it at some point in my life. Why prolong the inevitable?
Reference: https://www.quora.com/Is-it-good-to-have-regrets-in-your-life