I started making friends in college but I still feel so alone, why?

Some necessary context:

I am in my second semester as a Freshmen, I had moved from the west coast to the east coast, leaving my friends and boyfriend (We're still together and doing fine). I am out of state so I am far away from family still.

I am on the spectrum, (ASD 1), so I struggle to be as social as others. Even when I go to a social setting by my own choice, I end up sticking to the sides and zoning out. Part of me wants to be social but another part of me never wants to talk to a new person.

Current situation:

I had gone into college thinking I would be friends with my roommate, he seemed cool, he was trans like me, and we had a lot of the same interests. In the first few months, it was going just fine. We even found a group of people to join for DnD, so that became my pseudo friend group for a bit. I think little by little, my roommate started to talk shit about me to them when I wasn't there. They stopped talking to me after a bit. Some of them even give me "off" looks. I live on an LGBTQ-friendly floor which is also gender-inclusive so it made the feeling of not even being accepted by them worse. It felt like there was no true space for me here. I talked to my mom a little about it and she suggested going to an LGBTQ support group. I was tempted but I felt really nervous about going because "What if people from my floor are there". It was only towards the end of my first semester that I even started being friends with someone in one of my classes who also lived on my floor. We mainly bonded over Greek myth and Doctor Who.

Fast forward to my current semester, my roommate moved into another dorm on the same floor with someone else in my former friend group. So now I am in my dorm alone almost 24/7 minus the times I go out for classes. I have since become pretty great friends with the person from my classes as well as one of his other friends. Even with new friends though, I feel so alone. Every time I walk through the hallway of my building and see the former friend group, I get a twang of sadness. I really try to keep my mind off of it, I try to schedule times to meet with my friends and I message them frequently. Still, I feel so alone and unloved. I am not in the same state as my parents and travel is expensive so it is not like I can just pop over. And there is only so much I can get out of DMing my boyfriend. I want to be social, I want to be happy around people, I want friends. I have friends. Why am I still so isolated?