Your connection with darkness is through your interest in vampires. Theese occult beings fascinates you. Their lives are just something you would kill for, and if you would have the opportunity to be sired, you would. Living a mortal kind of life is just so ordinary and boring. You aren't necessarly evil just because of this interest/obsession, you just can connect with them and their lifestyles. Though people have a hard time understanding this and chances are you're a social outcast. Perhaps you hate your life and therefor developed this interest, to escape reality.