Personally I've never regretted anything I did. I have regretted things I did not do. Not trying is apathy is death. Failing is essential for success. Those who don't fail are not setting their goals high enough. Also, as they say, it's about the journey rather than the destination. If the destination is failure, but the journey there itself is pleasant and/or educating, is it then really a failure?
Searching through my notes file I found this thought from August 2023: I would call myself a professional failure. I fail at most things, and I fail constantly. Perhaps the only difference between me and most people is that I don’t revert back to the “normal,” the average, the safe, the mediocre. I keep on failin’. This from February 2023: "Having failed as many times as I have, my subsequent chances of success are much greater than of those who have not failed at all. And this from November 2022: DON’T BE AFRAID TO FAIL People tend to worry about screwing up, failing at something, not doing good enough. You should not worry about any of that. The only thing you should be worried about is whether you are doing the right things in the first place. How they turn out is irrelevant for all intents and purposes. Focus on whether you are doing the right thing and putting in the required amount of effort.