I've made my share of mistakes but the circumstances of my life have come together in a pretty satisfying way.
If I'd made better use of my schooling, for instance, I'd have had a better job, made more money, had an easier life ... but I might not have met Mrs Didge, my kids would never have been born, and their kids and grandkids wouldn't even be blips in my imagination. Once we start altering the past the changes we make come with a price.
I can think of a few people I could have been nicer too, though. It would be good to be able to correct that.