Just some questions ;)
If I understand you correctly, you say that; you or another individual (or group of individuals) can scribble their opinion on paper that say; I may not kill myself? (law)
Do you think that the opinion of others can force me not to commit suicide?
What are you or the other individual(s) gonna do If I don't obey the scribbles.......send the hired mercenaries to make me obey and if I don't obey eventually, they will kill me?

If I don't own my body. (owning meaning having the last word, the highest say)
Then who does own it? You? some other individual(s)?