But that's a religious thing.
What's wrong with believing you have a spirit right now, like the grass, trees, animals, and other humans.
Why this focus on "after death" when you can't even honestly say what it is?...
The ancient tribes dealt with this issue over more moons than we are comfortable counting, but came to the same result.
When you did your body will return to the earth from where it came. You might believe it will become part of some star, but that's just a fantasy. The Earth we live and die on is a rock of eternity. It's brightest, hottest days are long gone.
But even then, our spirits can burn every day, like a star, only smaller