I smashed an ant. And nothing happened.
I was a child when I saw the ruined life of an ant. Probably that was the ant. Probably that ant was an with a well-organized colony. Perhaps the ant had a family and a past, but now its future was cut short. You saw the body; soon it’d decompose leaving memories and a bridge built from twigs.
The brain was crushed, the heart no longer beats. You can think about any kind of afterlife but the reality is that ant’s own self doesn’t exist anymore.
Have a look at your local average life expectancy numbers, adjust an age by your lifestyle and habits… And think. Do you believe that you will be remembered for your accomplishments? And after all, was the ant worried about its own legacy?