If immortality was a thing

You've got several questions there. No way in hell I'd want to live forever. I'd not be much interested in living very far beyond my three score and ten unless I had reasonable good health. Who'd want to live for centuries in a state of decrepitude? The question is more a matter of what quality of life one could expect with an enhanced life expectancy.

In the 1990s, Kim Stanley Robinson wrote a Mars trilogy: Red Mars, Green Mars and Blue Mars. A good deal of the narrative is taken up with the consequences enhancements which, effectively, allow people to live for centuries. The ability of the rich to get the treatments, while the "salt of earth" cannot is blended with what we would call climate change to explain widespread regional wars. In effect, the citizens of poor nations, largely in the southern hemisphere, launch human wave attacks against the wealthy nations, having not very much to lose.

If the immortality enabled you to stay strong and healthy, yes, I would want to live forever. If you get more and more feeble but don't die, that's something else.

Why do you think you 'Don't' live Forever?
Let me teach you something.
You Will ALWAYS BE YOU!
Eek!