Ending up on life support is the biggest fear of my life and no matter how I talk to this with my mother she is just not of the idea that people can just choose

Ending up on life support is the biggest fear of my life and no matter how I talk to this with my mother she is just not of the idea that people can just choose not to stay alive. I truly believe she's the kind of person that will keep me plugged into a machine so long as she can still feel like she's doing something to keep me alive. We never, ever agreed on the dignity of letting go and dying in one's terms... Of course, I dont live with her anymore, not even the same country... but one of greatest mysteries for me will always be what her idea of life is, we're both religious, I just dont see any point in keep pumping air and blood into a dead corpse... I would seem to be someone figured a way to make a load of money on grief, which disgust me to no end.