Is it normal that i have gorey daydrems?

Title says it all. I will try to explain these in very little detail, but i will have to say, TW for self-harm, gore, things like that.
I am the healthy weight, but I feel like my doctors are lying. I have always felt overweight.
Anyway, the daydream starts off by me getting a sharp object. Even things that may not be sharp, like my bass strings or glass (all of the actions from now on are in the dream, don't worry, I'm fine.)
I sit down, alone. I lift up my clothes on wherever on my body, (most commonly, neck, thighs, knees, stomach, arms, places with the most "meat".)
I take the sharp thing, and, I think you know the rest. I take out the fat, and throw it away.
I wrap gauze around the area and in about a month, it heals. I am refraining from detail so as it isn't too disturbing.

Anyway, yeah. that's pretty much the extent of the dream.
Thanks for reading, and along with the vote, could anybody please comment what to do? A lot have suggested a therapist, but I don't know.