Optimal Distinctiveness Theory
You want to belong AND stand out. Those two needs fight forever. That's the whole game.
Grounded in the research on Optimal distinctiveness theory (Wikipedia)
The two drives that never stop fighting
Marilynn Brewer dropped this in 1991. Your identity runs on two opposing needs: assimilation (belong, blend in, be part of something) and differentiation (stand out, be distinct, not get swallowed). They are in constant opposition. Satisfy one too hard and the other starts screaming. Both maxed at once is impossible, so you're always negotiating.
Optimal = the group that gives you both
The mechanism: you identify hardest with groups at the optimal level of inclusiveness, the size that feeds belonging AND distinctiveness at the same time. Too big and generic (humanity, everyone) = you feel like a faceless nobody, differentiation craving spikes. Too small and unique (just you) = isolation, belonging craving spikes. The sweet spot is a group big enough to belong to, small enough to feel special in.