You were a girl with messed up life, so you decided to shift to Hogwarts.

You were in class of dark magic when suddenly Snape started talking about Shifters:

Snape: "Shifters!.. real or myth?" He asked the class with his arms crossed behind his back.

Hermione: "Myth." She said with her hand raised up.

Snape: "Wrong."

He said as he looked at you and you got bit nervous as the whole class so were looking at you, Hermione, Ron and Harry were confused..