We humans sometimes do our worst sins in private. But our punishment, if we refuse to repent of them, will be public. This passage below explains that those who repent and are saved by grace will dwell with God in the New Heavens and New Earth, and will be able to observe the punishment of those who would not repent of their selfishness.
As the new heavens and the new earth that I make will endure before me,” declares the Lord, “so will your name and descendants endure. 23 From one New Moon to another and from one Sabbath to another, all mankind will come and bow down before me,” says the Lord. 24 “And they will go out and look on the dead bodies of those who rebelled against me; the worms that eat them will not die, the fire that burns them will not be quenched, and they will be loathsome to all mankind.” (Isaiah 22:22-24 NIV)
This punishment will be terrible, just as terrible as the sins we commit against our brothers and sisters.
But of course God loves you, and has provided away for you to escape this punishment as great personal cost to Himself. You must repent and believe in Jesus Christ, the Son of God.