Percy Jackson And The Lightning Thief (Book 1) - Rick Riordan

Half boy. Half God. All Hero.
Look, I didn't want to be a half-blood. I never asked to be the son of a Greek God.

I was just a normal kid, going to school, playing basketball, skateboarding. The usual. Until I accidentally vaporized my maths teacher. Now I spend my time battling monsters and generally trying to stay alive.
This is the one where Zeus, God of the Sky, thinks I've stolen his lightning bolt - and making Zeus angry is a very bad idea.