I feel that your body is just the 'house' you inhabit while you're alive, and that once you die, the house serves no further purpose. Your legacy remains in the memories of the people you interacted with while still alive. Unless you've done something important enough to be preserved by history (Lincoln, Curie, Hitler, Babe Ruth....), the essence of who you were is lost within three or four generations....

As our bodies mature in the womb, there is some moment of epiphany that there is a sense of "self". The number of cells and specialization of a biochemical, biomechanical, and bio electric process that creates us as an individual, but still does not define us. It seems flawed to think that we just stop "being" when the body fails. This isn't fear of my mortality speaking. It seems wrong that the only remains of us is chemical compounds.

Now when I die
Now don't think I'm a nut
Don't want no fancy funeral
Just one like Old King Tut

We are but dust.