If you think bullying is just beating people up, then let me enlighten you in that it isn’t.
Believe me, I was never beaten up, but the whole mental / psychological warfare? The whole “are these girls really being nice to me, or are they laughing at me behind my back” thing? That was my school experience from 5th to 12th grade. As I got older, I shrugged it off more, and cared less, and just tried to get by.