I have this interesting thought

This is nothing but me day dreaming in fact I think about this alot but here's the scenario I'm walking to my truck as I'm leaving a store or the gym or something and it's night time someone hits me in the back of my head knocking me to the floor they're constantly beating me as I'm trying to get back up then that's when I feel a cold barrel on the back of my head as my face is in the pavement my hearts pounding my body is in pain from the beating I like to think of warm blood dripping down my face then he pulls the trigger I feel the bullet go into the back of my head as my skull cracks open then my brains go everywhere all on the pavement or if he slit my throat I wonder if the blade would feel cold or would my blood make it feel warm but those are only small thoughts that and reoccurring thoughts of getting a thick pair of scissors and cutting my fingers off or shoving them down my nails I can't stop these weird thoughts and I'm a little concerned