There are different sorts of crowds.
- Crowd due to necessity: For example getting on a train that is more than full - it's uncomfortable, temporary, but not particularly stressful aside from the physical discomfort, because I'm off somewhere else with my thoughts. Noone enjoys that situation, but it's bearable. Everyone tries to ignore everyone else.
- Accidental crowd: Many people just happen to frequent the same place, independent of each other. Pedestrian zone of a city, for example. Not a place to stay longer than necessary, but if the shortest path goes through there, I don't particularly care.
- Crowd with a purpose: Protests and the like. Those are somewhat worse. Like being swallowed by a huge organism. Breeding ground for strange psychological mechanisms.
- Crowd "for fun": Clubs and the like. Those are the worst. I feel like I'm sticking out like a sore thumb and totally in the wrong place. Sensory overload and no personal space. Trying to wear a fake smile as camouflage, but gets harder every second. After a while, I start fantasizing about ways to reduce the number of people. The pressure builds inside me until it feels like I should be able to cause a big psychic blast that flings everyone aside and gives me room to breathe. *shudders* Never doing that again.