trust me so many people think that they wont fit in or people wont like them. My advise is to make sure u go to as many fresher events as possible its the best time to meet people and they will be the most friendliest at that point as they want to meet people too and agree with the above join societies. At uni you really do find people from A to Z. I did feel the same, thought i wouldnt have many friends but in the end i had too many and became quite popular, and remember be urself enjoy it !!!