Oh God, am I at risk for schizophrenia?

I'm 16. Sometimes, I feel way too paranoid. Whenever I go downstairs and it's dark, instead of just feeling scared, I imagine that there are monsters waiting for me in the dark-like zombies, flesh-eating demons and animal-like creatures that screech and try to tear me apart. Darkness is a crippling fright. I'm always afraid there will be a dead person watching me from the corner at times. I check behind my shower curtains if I feel uneasy, and when I close my eyes in the shower, I'm afraid of being grabbed, or seeing a person with a melted face when I open my eyes. I have to turn all the lights on around me, but I feel safe when I'm home alone, lol. I also have ADD, and had I guess what you could call OCD as a child. What do I do?