You are correct only in the sense that if you choose to imprison yourself, you are not really a prisoner. If you choose to enslave yourself, you are not really a slave. So you are right. Inalienable rights, technically, cannot be voluntarily abrogated. Suicide, however, is a different story, as it is irreversable. But whose fault is that?
Might makes right? The fact that a person can do something equates with a right to do it? People can do lots of wrong things, but we don't elevate those to a human right therefore.