I lament most of the things I've ever not done (that old cliche), but I've been thinking more about my decisions (which weren't really decisions) post university.
Principally not moving to London when all my friends lived there because of my weird resentment of London (4 pounds for a pint?!) and instead moving to Bristol to do an MA (excusable, I suppose) with one other equally antisocial friend, then sticking around for like 4 YEARS there, doing shitty data entry jobs and living in almost complete isolation most of the time, when a (half) whole NEW set of friends was living in London and having a great time partying and taking drugs. Finally moving to London when most people had fucked off or got married/had kids... And sleepwalking into a profession that I feel almost completely alienated from.
I want to go back in time and charitably slap myself in the face.