or did do.
I regret not eating much meat/protein as a kid. Might be a few inches taller if I did.
I regret not learning to play an instrument or even discovering any music.
I regret not getting the balls to be asked to move tutor groups when I was bullied by someone in my class between ages 11-14.
I regret not seeking counselling about that at the time. If I did, I'd probably be less of a socially anxious wreck today (until the next social disaster).
I regret approaching my 4-year-long secondary school crush the way I did, and not telling her how I felt before she went out with someone else for 2 years (which I spent in ongoing agonising heartache).
I also regret not studying harder for my A-Levels (which is linked to the above, which I'm not proud of). Should've graduated ~2/3 years ago.
Still, everything seems to be turning out pretty okay so far.