Ask HN: What Do You Regret?

Another year is coming to an end.

While it‘s generally wise to focus on the things one can change, I‘m curious what things in your life you regret.

I don't mean things that you would regret theoretically if you thought about them. I mean things that you actually find yourself regretting every now and then in spite of yourself. Things that your mind gravitates back to in moments of serenity that give you a sense of regret or sadness about something you did or didn't do, even though it was years or decades ago.