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Sorry, here is a more accurate answer:
Full of self-pity, and ready to sulk, Tom walks down the street away from school thinking himself to be some kind of social degenerate: "He was a forsaken, friendless boy." In his plight of loneliness, Tom decides that society has forced him to go into a life of crime.
I think he runs away.
He decides it's time to become a pirate and live on Jackson Island with his friends (also to become pirates).