I read this a while ago... I read it very fast, mainly because it was very very painful ... and rereading today. What a shame there was no adult who understood what you were doing.
It's amazing you can remember things from when you were so young.
Too many people have no idea how sensitive and acutely intelligent some children are.
It's time to celebrate that you grew a conscience that refused the normality of joining in with the idiotic bullies - you didn't seek to replicate that behaviour on someone else, as you got older, in order to be included.