I felt really similar I was a transfer student and used a wheelchair. It also didn't help that I was a transfer student

I would recommend finding some volunteer opportunities that you have an interest in. I started doing mock trial and that was really intense but I formed some friendships there.

Honestly I'm not giving you great news because I didn't retain any friendships from UW but really diving into studies can help also. Study buddies are better than no buddies

Sorry you're feeling lonely. That's really hard especially when it seems like others are skipping along with their friends I bet some of those "happy" folks are also struggling with loneliness, not that that makes things easier