Its all on how you look at it.
I see nothing wrong with the decay of the body. After all, our bodies wouldn't even exist if the elements that make it up weren't put together inside stars that blew up.
My body IS the universe, made from stars, its beautiful even though one day it will return to the earth from whence I barrowed it. I don't see it as a piece of trash. Do you look at nature as trash?
As far as living for ever, I wouldn't want to. Not only would an after life render this one completely worthless but no matter how good an after life was, I would get tired of it.
If the after life is better than this one then it would render this life far less to zero value. You think you get to watch sports and drink beer in heaven? Yep it's just like this life but better right?