Not necessarily for me. It the pros of what I achieved and experienced outweigh the cons of my weighty regrets, it's preferable. Plus, regrets can lead to good things too, depending on what does with them. If you've ever watched the reboot of Doctor Who, for example, that is in some respects the basis for the entire show. An immortal being driven in large part by his regrets for his role in a war keeps trying to compensate by helping other people. He largely keeps the universe from falling apart.