Try to be a good person because it's the right thing to do, doing unto others being a fair way to treat people. Let's say there really was a Hell. Would this change anything about the merits of goodness toward others? No, not being a dick to other people most of the time is still an admirable thing. If there is a Hell, God will do whatever pleases him no matter what you do, so practice decency for it's own sake. You can at least be led off to eternal torment with God leading you toward the place of your imminent suffering, knowing you didn't hurt anyone near as bad as you are going to hurt in the fires you are about to endure. Your case is hopeless, but you will suffer eternal torment knowing that you didn't really deserve any of this, and perhaps that will give you some solace.
You will get to know and understand God as the dungeon's deity of ultimate despair, while he sometimes tightens the screws himself and takes pleasure from the pain he inflicts on you and others. He is God the Almighty, and you will understand this better every time he breaks one of your bones or violates an orifice with a glowing iron poker that he drags from a fiery forge. He is your Lord and Master, and you will have arrived at your destiny. So enjoy being nice to others while you can, because you won't have much time for it later on.