Is it normal to masterbation to beheading videos

Is it normal to masturbate to violence. I tried to quit it but I can't I'm simply addicted to Gore videos they turn me on I came to the realization I'm a sadist I make my girlfriend beg to be murdered in the bedroom and she love to take pictures with a knife to her throat I know I have a fetish but I'm I normal or am I going to turn out horrible idk I simply want to know if it's normal to get off to violence