What hobbies or interests do you have? My son has AS but is very into guitar and card games (YuGiOh etc) and is also heading off this year, so it's (hopefully) not going to be too bad for him because he can meet people without having to initiate conversation with both those hobbies. It might be worth making a list of your interests and hobbies and checking the Societies list on the SU website for your university to see if there's any suitable groups. Also check and see if there's an AS support person and see if they have any suggestions or techniques for you. I know my son's Uni has a dedicated AS support team who have loads of experience and useful suggestions. At the end of the day the people on your course are just that, I know when I was at Uni the vast majority of my circle weren't on my course (or even at my University! We had shared halls with another Uni).
I also remember vividly sitting on my bed about 1/2 an hour after I arrived at halls on the first day thinking that I'd made a huge mistake, and how was I ever going to meet people or 'fit in'. It is extremely daunting, especially when everyone around you seems to be making effortless conversation. I did find it difficult but was lucky that I met people through various activities (swimming, orchestra and playing pool). In fact playing pool was how I met my husband!