I wasn't physically picked on that much, since I was always quite tall for my age when I was at school. Some kids would shove me, though, and throw basketballs/ softballs (which aren't at all soft) at my head during recess. Girls would come into the bathroom and shove open the door (the doors didn't lock) while I was on the toilet.
They used to start rumours about me, things like how I never showered or shaved my legs, because I once told someone that lice don't like dirty hair, or something.
Some teachers were just as bad, always screaming at me and treating me like an imbecile, whereas they would treat all the other students as though they were all perfectly normal.
I was always teased for wearing track pants instead of a kilt, though that stopped after the woodwork teacher was done for predatory behaviour (he would get all the girls to sit on the benches after class, walk around and pretend to drop something/ inspect the floor so he could look up their kilts).
The most humiliating time was when a group of girls wrote a bunch of erotic stories and signed them with my name, then left them somewhere for someone to find.