Uni is pretty good it a very different situation to a school or collage it's a much more relaxed atmosphere snd everyone is there because they want to be (not because their parents made them go) if they don't then they leave.
The people are pretty cool for the most part you'll find for the most part 2 types at uni those who are normal go to lectures and go out socialising to clubs and things and are pleasant company and those who get pissed every night because they are students and it's how to act. but for the most part people are generally friendly and just want to know you for you.
Halls is an adjustment you will find that halls rooms are somewhat smaller than the average police cell (although more comfortable and with windows hall are ok they are pretty comfortable and for the most part friendly the kitchen is where everyone meets for a night out you'll have about 5 people to a "flat"and a kitchen but you'll have your own room which you can decorate how you want (we'll not paint) with posters plants what have you (don't forget white tack).
Clubs and societies are great and where you'll make some really strong friendships most have socials and also do the activity they were set up for and there are societies for almotst any thing from foot ball to harry potter really you would be hard pressed to not find anything your interested in.