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At age six, she knew something was different about her.
At age ten, he knew he was a boy.
At age thirteen, he cut his long hair after being picked on by the other kids. "Boys don't have long hair" they said "Can't be a real boy with long hair. "
At age sixteen, he finally told Itachi about the abuse at school. About the students picking on him, calling him names, picking fights with him. About the teachers that ignored it, how all the grownups knew but did nothing. About the nights of crying and begging for it to end.
At age eighteen, he started his full transition with Itachis help. Everything he needed, Itachi paid for. It made him want to cry joy.
At age twenty, he finally did it, he finally got his name legally changed. It felt so right.
At twenty-one, he was finally able to express himself completely. To finally show everyone the true Sasuke Uchiha.