Do you feel that way because you're being abused? Or do you feel that way because you might be an undiagnosed psychopath (and I do mean that in the clinical sense)? Because that's two very different things.

I'm not qualified to tell you what to do if it's the former; I don't know how unsafe you are but I would encourage you to get out of the situation. I hope others can be mor helpful.

If it's the latter, then you need to start seeing a therapist. If you want to be able to continue to be a part of civil society, you'll need to do a lot of work to curtail those impulses. Again, like the other scenario I hope others more qualified than I can be more helpful