When Scales Fall.

A boy is born in an orphanage, with nothing but enemies. He is scrawny and often bullied. One day, he sneaks out, and discovers something quite odd about himself. He thinks of himself as a monster, but he ends up having to save the world, in pre-apocalyptic wasteland.

Cover art not mine!
The first book of a trilogy!
Inspired heavily by the Anada trilogy (It's really good)