I'm not. And I have had some great fun pulling pranks on other people with it.
Once we were visiting a manor from my family, with my cousin. I abandoned her in the labyrinthic upper floors before turning off the electricity on the whole building. You should have heard that scream. She was crying when the rest of the family found her, paralyzed. I don't know why the fear of darkness, it must be some kind of primitive thing.
I remember being a child, sitting in the dark of that vast living room, surrounded by old furniture and portraits of ancestors long gone, watching. Darkness isn't necessarily dangerous. The things that lurk inside people's minds, well. That's a different story.
Some family considered me a bad influence, called me "devil" That kind of irrational fear, that ignorance. That's what monsters are really made of.