Imagine if noone did die, the overpopulation problem. Hell, we're having that problem even with our mortality.
Your science fiction is poorly written.
Immortality as you put it, that is, human beings not dying, would obviously require some kind of super-natural force at work which would change things imprevisibly. I doubt over-population would be a problem.
I dont think I have a choice. I will live forever regardless of whenever I want to or not. Off course, im not saying that this body of mine will last forever, but that I dont believe that the consciousness can end. When I die, I will continue to exist in another form. I have no idea of what that would be, I only know it will happen.
Within our know world, living for very long isnt all that impossible though... im young, and technology is advancing quickly... by the time I am an old man, maybe we will already have the technology needed to extend our lives indefinitely. Eventually an accident or disaster will kill me though.