If you are s teetotaler, live in an area with little choice of clubs, don't like loud music and go alone or with the wrong people: a lot.
But I wouldn't worry about it too much, OP- I spent my first night in halls at Uni in my room alone, depressed and playing Oblivion into the early hours of the morning. I didn't even introduce myself properly to my flatmates (and there were 19 down my corridor) for the first few days. It then didn't take too long to break the ice, once everyone else had taken the opportunity to settle in and- a few disappointing nights out aside- it wasn't long before I learned who were the nicer people and who were best avoided. Three of my flatmates I eventually came to trust enough to live with in private accommodation for the rest of my time at uni, and I hope to stay in touch with them for a long time to come.
Pro-tip: If you have a kitchen area (however small) save yourself some space for some hot drinks/fruit juice and snacks so you can pop in and out frequently. Given that everyone will need to use a kitchen at some point, they are a great place to strike up group conversations, and you'll be too busy cooking/eating for it to feel particularly awkward. The drinks and snacks are also good to offer to any visitors you may have, especially if you made them yourself!
