I think the main issue here is that you are not in halls, thus you are not in an environment where you can easily meet other people and make friends. Also, if you have missed freshers' (you didn't say whether or not you did), you are also at a big disadvantage.
The best course of action for you would be to try and move into halls, although I appreciate that if you have chosen to commute there are probably financial constraints.
So, join societies and try and talk to people in lectures. Make the most of seminars and group activities, as they are a prime opportunity to get to know others.