Actually, the "question is" What is wrong with you and your "family"?
Pulled the plug 6 months ago on my Dad. It was what he wanted. He said so for the fifty years that he practiced Medicine.
I never had any doubt.
You, on the other hand might want to consider the integrity of others whom have been gifted the power to make these decisions (through your own hand, apparently)
for your sacrosanct little self.
I have been through a similar exercise - it is a hard task, and ought to remain so.
But I am more than a little frightened by the casual ease that many express about an explicit living will. They do not understand that such simple statements as "no tubes/wires" have the force of law when placed there, and can prevent even the most transient use of temporary support measures, such as a drain, a catheter, or even a heart monitor, that CANNOT be overridden by permission from the family.