Was literally up thinking about the same thing and then I went on reddit and saw this... I’m also in grad school and feeling super isolated. I was the planner of my cohort, and invited people out to do things throughout the course of my first year. I didn’t see much planning on the part of my peers but just figured it was the social awkwardness of academia. But now that it’s summer, I know that it’s just not reciprocal - in that, I think people like me, but they don’t initiate hangouts with me and I have to ask people to do everything. People seem to like me (I even got invited to a wedding) but then don’t invite me out when I know they have a lot of group hang outs.

I guess that’s not particularly helpful. But I feel like I’m going through something similar, so I can empathize with you. I’ve gone through times when I feel popular, mostly early on in undergrad, but now am feeling more isolated than ever.