You are Severus Snape’s daughter! But no one know excepted for you and him obviously. You're in the same year as Harry, Ron, Hermione,Draco etc. It's 4th year. Now you're walking towars the library. It's the start of the year, then tou dump into someone who is no one than Draco and his friends

Draco : Well! Are you going to stay on the ground or something!? Tchhh Mudblood these days!