Why do some people try so desperately to fit in with the ‘cool crowd’ in school?

I have noticed this in school or college especially. Some people constantly suck up to who they perceive to be the “popular group. Some even ditch their other, less cool friends to desperately become something they’re not when it’s clear the “popular group” doesn’t even want them. Why? Why can’t people just be themselves
Why do some people try so desperately to fit in with the ‘cool crowd’ in school?
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