Does it make you sad to think that the earth will end in 5 billion years?

I was looking at the timeline in the book “The World Without Us”, and it made me kind of sad to think that the earth will one day billions of years from now be enveloped by the sun. I don’t really expect mankind to still be hanging around by then, but it still upsets me a little. And if by some gaffe they still were, I certainly don’t expect to have any ancestors that far down the line. Also, the earth is already about 4–5 billion years old, so it’s middle-aged. And in such bad shape! I feel bad about the whole situation. Is this a totally abnormal response to these kind of concerns?