I have dark fantasies plague me
Are you joking? What sort of fantasies are plaguing you?
I mostly fantasize about torturing and killing people, I often imagine the sight of their death
I hear what you're saying, but it is terrible to imagine other people being tortured and dying. You should focus your thoughts on positive things and help others, otherwise you might end up acting on those fantasies and hurting other people.
I feel misunderstood, I'm not planning to go out and murder someone. Don't worry about it.
Even if you don't plan to act on them, having dark thoughts like that is wrong. I think you should consider talking to a therapist about that.