Ah Uni. The best days of your life. I had 4 great years at uni.
Made friends on the first day that I am still in touch with 14 years later.
Tutors were all fantastic, lectures were okay (even with a hangover) nights out were brilliant - dinking games, cheap beer etc.
I really improved my pulling technique at uni and there were lots of lovely ladies.
So to sum it up, don't worry, see it as a new start.
If you are shy, you don't have to be at uni.
If you are a geek, you can still be but with more of the same people.
You will find people who you like, people you don't like.
It did help me that I enjoyed alcohol though!
While I am on the subject, one memory (and there were s many good ones) was when me and my mates gatecrashed the Christian Barn dance. My mate ended up spinning the principals wife around. Her feet actually left the ground.
Anyway enjoy uni. It's fantastic.