Naruto Uzumaki was hated by his village. He was hated for something he had no control over. It wasn't his fault he had the Kyuubi sealed inside of him.
Naruto was always beat by the villagers, abused physically and mentally by everyone. He was also shunned by the people who were to scared to get close to him.
Naruto was a smart child, he also had been. You could say he was a true prodigy.
The three year olds mind was filled with hatred toward the whole village, he wanted them to suffer for what they did to him.
One day the young blonde was sitting alone on his swing that was tied to a tree close to the academy, when he was confronted by a masked man.
The man offered him to come with him, and together they would destroy the village of Konoha. Naruto instantly agreed and that's when he became the son of the Uchiha.