Why am I drawn to the darkness or the ocult?

Ever since I can remember I have liked "evil" stuff.. I used to collect toy sculls and skeletons. I have always liked music, movies and books which contains something about monsters, ghost and stuff like that. I have always liked the colour black and would not dress in anything but black and dark clothes when I was a child. I used to pretend that I was a vampire and that I killed a lot of people. I'm wondering if I might become "evil" or something like that later in my life.. (I am 18 years old now btw)