I was thinking about that banal thing folks often say, that you don’t regret what you did in life, but what you didn’t do. For me, this is not so. There are almost no things that I chose not to do or that fate wouldn’t allow me to do for which I have regret. And the few things I didn’t do for which I have regret are all things I can still do (for e.g., I sometimes regret that after by post-B.A. studies I didn’t continue on to a Ph.D. And I sometimes regret not going to law school. I can still do both of those things).
The things I regret in life are things I did do. And you can’t do much about those, other than try and make amends if you feel the case merits them, or just try to learn from them or, failing being able to learn from them try either to not think about them much , or put them in a book or column.