Nutshell

I think they are talking about the scrotum, since the scrotum is a nut shell.

"and yet I fight, this battle all alone, no one to cry to" to me is about the battle a scrotum goes through with it's owner's fist during extended sessions of masturbation. The scrotum cannot do anything about it, hence 'no one to cry to'.

As for 'My gift of self is raped, My privacy is raked" it seems that the scrotum is having trouble dealing with the fist that comes to pound it for hours on end, not giving the scrotum and privacy.

"I'd feel better dead" is the scrotum's way of saying, I'm tired of all the masturbation sessions and I'd rather be dead than go through these constant beatings.