The WTBTS planted the notion in my mind back when I was a child, that I should want to live forever and that living forever was the only way life could have a purpose. My feeling now is that a limited lifespan makes life more valuable than one that goes on and on and on, the same way a rare coin is more valuable than those whose supply is unlimited.
I don't want to die in pain or prematurely but I also feel that living forever, even as a perfect person, might be a nightmare. Maybe wanting to live forever is just being greedy. Just because I was randomly conceived all those years ago, doesn't mean I should expect to go on forever and ever. If my parents would have had sex 10 minutes sooner or 10 minutes later, I might not be here. Another girl or boy sperm may have made it to the egg instead of the one that made me. To think that it should go on and on is not something that I would have expected without having had that idea put in my head. Not wanting to die would makes people accept any alternative concept, no matter how unprovable it is, as a way to console their apprehension about the unknown.
I now have so much more peace knowing that when I die one day it will be because that's the way it is on this planet rather than because I will be destroyed by God for not spreading Watchtower literature enough throughout my life or not reaching out for enough responsibilities in the congregation or because I disagreed with some religious groups explanation of the Bible. If it turns out there is some sort of afterlife/ reward, I don't see any reason why I shouldn't be a part of it.