I'm 16 years old and I still have this weird fear of a monster under my bed.

I understand that this is probably a rather strange and uninteresting confession but I'm just seeking some sort of explanation. But basically, if I'm in my bed with the lights out and I drop something on the floor, I have to go and turn the lights on to pick it up because I have this irrational fear that if I try to pick it up in the dark, then this old crusty hand will suddenly reach out and drag me under the bed. But I only have this fear when I'm alone. Could part of this fear be due to the fact that I had an extreme fear of the dark as a child? I was so afraid, that I would sometimes sleep with my lights completely on. I also think this fear may have started when I first watched a Scooby Doo episode where Shaggy and Scooby were hiding in a bed from a monster and the monster turned out to be under the bed and grabbed their feet. The more I think about this, the more ridiculous i sound.

TL;DR I have this slight fear that if I try to pick up objects off my floor in the dark, then some weird ass witch will drag me under the bed.