I'm one of the wussiest gamers ever. I couldn't play BioShock past the first boss. The constant whispers of disturbed people just around the corner who may or may not jump out at you is too unnerving. It took me like 10x longer than the average person to get the the point that I did get to because I was so scared to just walk in a room. I'd peek in, run backwards because I saw something (though it might have just been a chair), and creep slowly.
And I was playing the game with all the lights on in the middle of the day and playing She & Him in the room. Hope you're not as faint of heart as I am.
Of note, I find people losing their humanity and living an existence of despair, paranoia, and mutilation much more horrifying than any Monster, ghost, or demon.