For me, I don’t even think I’d even want to be friends with hardly anyone I knew from school looking at them now. School sports are largely tainted with chauvinistic bullshit, accolades are just meaningless pats on the back you forget about once you earn them and learning an instrument is something that is never too late to do. As long you didn’t make any choices that messed you majorly for the rest of you life like getting an STD or a drug addiction there really isn’t much you should regret about from school.