To have an inalienable right to life and so forth means not only that it cannot be taken away. It means that you cannot willfully set it aside. You have no right to sell yourself into slavery and nor can you contract for your own death. To claim a personal right to end your personhood is intellectually absurd and by definition irrational.
Or it used to be.
That's all well and good for you but don't be so hasty to sell the rest of us into YOUR slavery. That is exactly what it is.