Quite a good thread going on compared to the other junk on tsr.
Im currently a 3rd year at Uni of Manchester, the biggest regret so far were choosing the wrong group of mates. I met a few decent people on my course at the beginning but later fell into a crowd in my halls who were obsessed with taking various drugs such as k3t and mdy, and boozing out at dnb raves. This took a massive knock on affect on my academic career, and almost failed first year. Although I enjoyed it at the time, I no longer mix with that group. The Uni of Manchester night scene is so awash with drugs its so hard to avoid. After putting so much cr*p in my system I ended up re-taking some of the year 1 modules and suffered with deterioration in my mental health.
My other big regret is not joining societies or sports clubs in my 1st and 2nd year, primarily due to me just focusing on work and going out and getting p***ed. I would like to join sports clubs such as hockey and/ or rugby, but fear I may fall into the same trap.
Moreover I partially regret going to Manchester, although I received a offer at my local uni, which happens to be a red brick uni. I have now lost the group of mates I once had back at home, due to the fact I moved to Manchester