I can't believe I'm broken inside
Marius Black watches his brother and sisters with envy, though he won't admit it to anyone else. They have already started to show signs of having magic abilities. But he hasn't. He's not sure why he doesn't possess the same abilities that his siblings have. He just knows that he doesn't like it.
He waits anxiously for his Hogwarts' letter after his eleventh birthday, but it doesn't come. His parents are furious; he's never seen them this angry before – not even when Cassiopeia ruined his father's favorite dress robes.
When the Headmaster informs his parents that his a squib, they lash out at him. He's never felt the Cruciatus curse before but it's burning him alive. His cries aren't heard by his parents, but he knows he cried out. After his parents are done, he's told to leave and never return.
He doesn't look back as he leaves.