Authenticity

As stupid and dumb it sounds, it's true that I have this fear of paranormal activities and spirits. At first I thought it would cure itself as I grow up but the childhood experience has left a deep impact on my life. Not like a ghost or something, I simply was locked in a dark room for a whole night all alone. The room had its own made up stories and past and since then it has been a nightmare. I know it's completely stupid but I want to cure it. Any true and genuine advice is much appreciated.