Living forever and dieing are equally scary thoughts.
Dying to me is the end and no thoughts whatsoever after. I wont be able to enjoy the things I did or even have any memories of what I did. Its just a desolate pitch black darkness for eternity
Even if you were granted eternal life, the universe has an expiration date. Eventually all the stars will die, and the material needed to create new stars will be exhausted as well. Until there would be no source of energy left and you would be in the middle of a pitch black darkness eternally.
[spoiler]
That was a really basic explanation of the death of the universe. Numerous other theories exist such as:
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The Big Rip
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Heat Death
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Big Crunch/Big Bounce
[/spoiler]