This will sound harsh, but you seem to have a victim mentality, which isn't going to make it any easier for you. If people previously had to point out that you were being bullied, can you recognise when it is happening, or will you translate every negative thing that happens to you or is said to you into bullying? Please try not to worry about being bullied, and if you think it's happening, take a step back and look at it from a distance. Is it a recurring behaviour targetted at you? I have known people with Aspergers who were very sensitive, and thought that they were being bullied in several situations where they weren't, such as a person generally not being very nice, but not treating them any differently to anyone else; someone having legitimate complaints about their level of noise/clutter/annoying habits and voicing this in an appropriate manner; and even just someone having a very different personality and asking them to join in with things that they didn't want to do (this was only one person and they did change their thinking after a while!).
Bullying is pretty uncommon at University, because most people there are mature enough not to bother with it, and there's so much to do that picking on someone really isn't top of the fun list. That said, there are plenty of people who don't know how to live with others, who might be aggressive or bitchy to start off with, and whose attitudes might seem quite offputting to you at first, but most of these people won't be bullies.
Not being a drinker and not enjoying clubbing or partying is fine! If everyone else wants to go out, let them, and wander around looking for people who aren're going out - I made a really good friend with Aspergers when my flat stayed in one night in Freshers and his flatmates all went out, and he just wandered around the building until he found us still there and asked to join us.
If you do think you're being bullied at some point, ask a frient or a flatmate (preferably someone who knows you and the potential bully) how they feel about his/her behaviour, or just confront the person and tell them what exatly they are doing that you don't like. They may not realise that they are upsetting you, and if they did, they'll probably be surprised enough by you turning around and asking them to stop that they won't bother any more - like I said, there are enough things to do at Uni that bullying isn't really worth the effort, especially if you make it trouble for them! Unless you're really unlucky, your friends and flatmates should stick up for you, because my experience of University was that people were much less tolerant of bullying behaviour than at school, and nobody wanted to be friends with someone who was going to be that unpleasant, because there was no pressure to "fit in" with a particular social group like there was at school when you had far fewer choices of friends.