You'll be fine, don't worry. Your description is similar to about 1/4 of the people in my uni, and it's probably similar to that at Durham. Just be nice to people and remember that for most of them it's a completely new experience too. Also you have a week to get to know people before work starts, so you'll have the time.
Even if you don't find many friends at halls, you'll certainly make friends from societies. Make sure to have a thorough look through the list of societies online and at the freshers fair - you'll make a lot of your friends through your various interests.