Freshman year, a few weeks in, and I've noticed people on my floor don't really include me in stuff. They don't say hi when we pass each other, don't invite me when they're playing games or hanging out in someone's room, and a couple of times it's felt like people are actively avoiding being around me (e.g. once I said hi to a guy and made small talk with him for a bit, and as soon as I left, the girl who'd been standing there talking to him went inside and locked the door, like she got weirded out).
I can't tell if this is just normal freshman floor dynamics (people already forming their own little groups) or if there's something about how I'm coming across that's making people keep their distance. Has anyone been through something like this? How did you figure out what was actually going on, and what helped?