It makes no sense that we live to die. This is why people fear death. It was never meant to be this way. We were initially made to live forever! God didn't make us to die. What kind of God would do that?
Sin is why. This is why we must be born again you see? This makes a lot of sense if you will think about it.
Romans: 5. 12. Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
"Good people" don't get to Heaven, only saved ones do. Are you saved from your sins by true faith in Jesus Christ?