Huh. This one kind of baffles me. There are a lot of things in my life I wish I'd done differently, or better, or with more aplomb, but things I hadn't done at all? I can't think of one. I'm sure there are things from my youth that I regretted at the time, but now with the benefits of age (haha) most things I've done or been a part of were learning experiences.
If I hadn't done everything I've done, would I be who I am? There are one or two things that have happened to me that I wish hadn't or had gone down slightly differently, but those aren't thing I did. And besides those things also shaped who I am.