How did McCandless's childhood push him into the wild?

Chris McCandless was a very wild and stubborn child who lived a normal life with his family not lacking everything. He found out that his father lived a double life and hated the world he was living in.

Explanation:

He wasn't like every other kid, satisfied with material things. He wanted to make a change, to be noticed. The main reason for him leaving the society was the hate for modern society. He hated that material things were in front of the things that fulfill the soul.