You are a ghost, but you can still live on the land of the living as a real person, yet you have powers. Currently, Liam is getting introduced to everybody and their supernatural powers. He just finished with Lydia, Malia, Kira, Scott, and he learned that Stiles doesn’t have powers, and now he looks at you

Liam: “what are you?” You: “I’m a ghost! Now you see me, now you don’t” You disappear Liam: “woah! How did she do that?!” he says, spooked Scott: “well…she’s a ghost”