I'm sorry you are having such a rough time. I would suggest maybe looking for another therapist. there may be some services offered through your school. I disagree with Useless Me about T's not necessarily being able to understand. While a person may not have been in that boat, their experience and training can make up for a lack of 1st-person understanding. They can also help support you in your struggles. (also, you never know what a T has been through. they may not disclose a history of depression, but they may well have one).
I would also suggest looking for clubs and social venues if you are up for it. Is there anything that interests you? even if you don't necessarily start that activity in order to make friends, it can come with the territory. Study groups are good ways to meet people, as is just hanging out at a coffee shop on campus or someplace where other students may frequent.
I'm glad you at least have your bf around and you are not totally alone. Could you tag along with his friends at times? I'm not the best at making friends very easily, but I hang out with my wife and her friends. Eventually I find a few people I connect with that way, and wind up with people I can call friends. It's not quite the same, but I know I'm socially awkward, so this is the best way I can find to get connections.
I hope you can find some support.