Think of Wolverine before he was captured and made civilized.
No one likes half orcs. Not even their parents. Born to an orc woman raped by a marauding band of human soldiers, Imsh quickly learned that the strong ruled, and he was not one of them. His bretheren were all stronger than him, fiercer, tougher. His mother grew ashamed of his relative scrawniness to his orc cousins, grew tired of bandaging his wounds, of nursing his bruises, of him and his weakness. So she let him go. Imsh would have to scrape by for himself on the outskirts of “civilization”, feeding on what scraps he could steal, or beg for. He also learned that, while his orc cousins may have bullied him and beaten him, humans despised him. He would scrape by on the outskirts of their towns, picking at their garbage