I don't consider it fatalistic, only realistic. To think that this means that nothing we do matters, that would be fatalistic.

[ Though, well, fate tends to be fatal, so perhaps it is a bit, but fatalism calls to mind a very different perspective. ]

Personally, I think it makes our actions matter all the more. If we're dead or doomed, this is our last chance to do anything meaningful. We may not retain our connection to this world when we leave it, but ithere.

We might as well be sure what we leave will be something worth keeping.