I sometimes have very dark urges
Oh no! What type of dark urges are you having?
I don't feel comfortable talking about them.
Since you don't even want to discuss your darkest desires they must be powerful, but not getting someone to talk to about them is unhealthy for you. Try talking to a professional therapist so they can give you the support and help you need.
I want to kill people who are not you. I want to murder the people who don't respect me.
that is terrible you are feeling that way. If you are having dark urges, you should get some help. There is no telling when something like this would take control over you.