Because he's 8 and saddled with responsibilities no one respects him for.
Because the majority of his friends are backhanded terrible to him
Because he's a classical loser, usually a shut out loss when he attempts anything.
Because even when he excels and personally performs so well he comes in remarkably high; say SECOND NATIONALLY people still treat him worse for 'letting them down'.
Because his family is poor and can't afford much.
Because he's got a dog that shows him absolutely no loyalty.
Because he's directionless in life, and can't find the meaning in anything.
Because he's so stuck in his own head he can't even approach the girl he has a crush on and introduce himself to her.
Because even when he has something good going it implodes in such short order he rarely ever has a sliver of an unqualified good experience to reminisce on.
Because he's been through all the shit he's already been through and somehow every day there's a new way life shits on him.