Or maybe I spurred it, and thought that something unlimited might become boring and akin to some form of hell.
Personally, I've tallied up a number of things I want to do in my life, and after having done 2 big ones (well, one finished and one still in progress with a moving goalpost), I've realized just how long it takes to accomplish big goals. Even my incomplete list far exceeds 200 years already. I'll take the life extension, thanks.
So, no, I don't think this is just "a personal hangup" of yours...
Religion dodges the issue by presenting goals that cannot be reached, which I think is a fair compromise for most people.