I am OBSESSED with half-animal half-human beings. How do I get off it?

Okay, I got obsessed with vampires, like unconditily obsessed, and I somehow managed to seperate myself from it. I convinced myself I was one, though, and it took up a bunch of my life. I became a darker, morbid version of myself. I still think its in me somewhere, and it puts bad things in my mind. I want to be a good person, but its hard. I think its because of what happened then, but it could be me. I just want to get rid of all of the constant evil thoughts I have. I heard about therians, and now Im obsessed with half animal half human things. Example, Pericci, from Star Ocean. SHes like part cat,. SHe has a human figure, but cat appearance, tail, fur, cat ears, sharp teeth. Im really obsessed with this, again, unconditionally, and i want to figure out why, or some sense behind it. If its hurting me more, then Id like to get rid of my obsession. I dont really WANT to get rid of it, but if its hurting me more, than I must get rid of it. I want to stop thinking evil things, and I want things to be more clearer, more straightforward. Please help.