(TECHNICALLY you being younger than Harry Potter wouldn't be possible but you know what?Lets roll with it for the sake of my sanity :D) You are a young child and your mother/father is a death eater, locked in Azkaban so you were put under custody of the Hogwarts professors and the ministry so you live at Hogwarts and learn even if you aren't of age to be in Hogwarts. The Golden Trio, Harry, Ron and Hermione had arrived at Hogwarts along with all the other first years, like Draco, Crab, Goyle, etc etc. It was Harry's turn to be put into his house so he sat down on the chair and put the sorting hat on, the sorting hat thought for a moment Sorting Hat: "GYRIFFINDOR"