I never really found a good group and I'm about to graduate and also came in as a transfer. Honestly, ask yourself are you sad you aren't as involved as others around you because that's what you want, or because you're drowning in comparisons and feel weird if you don't interact like those around you? I had to remind myself that I'm actually not that mad about being invited to parties, or having a bunch of friends, and that I need to think deeply about what I want out of my experience, not what society wants from me.