Maybe whacking a rock against the door isn't the most normal way to knock for most people, but I'm not most people.
I'm Venus Stone, 14 years old and perfectly normal. Well, except for the fact I'm both telekinetic and electokinetic, for reasons I don't know.
The door opens suddenly and I drop the rock.
"Hi, I'm Venus," I say to the girl at the door.
Sorry it's so short, I'm being chucked off.