In school I would drift between crowds, I was part of multiple 'groups' but never really felt as if I was truly part of any of them. I just mainly focused on individual friendships, I was the one who'd have a couple of really close friends from different groups, I'd just share my company between the people I enjoyed spending time with the most. I remember in my final years of school my then best friend was the same, he was originally part of a group but got fed up with them, and then we'd just spend our time complaining about other people and mocking the 'pack mentality' they had.
The groups I was part of, really had no stereotype to attach to them. They're not all too common, at least where I was from. We didn't have "popular crowds" or "nerd crowds" there were just groups of people who really weren't that different from the next group.
Currently, I don't ever see any crowds, my college is just full of individuals. Most of my friends don't even know each other. At the beginning of the (academic) year, I was part of a little group (4 people, + myself) but it soon fell apart after one of our friends dropped out and the rest got increasingly annoyed with each other, so I just talk to them individually now. It's a shame really, because I think friend groups can actually be a really good thing if everyone's just nice to each other; unfortunately, it seems that's too much to ask.
If I had to apply a label, I'd say I'm part of "the people that hate other people, including each other."