The End of Our World and The Beginning of a New One

The world has been getting worse with overpopulation, famines, global warming, and nations were ready to go at war with each other. Accidentally, someone launched a nuke and all other nations followed. Nobody knows who pushed the button, but you will soon find out through time. One nation decided to launch a zombie virus so that it could be weaponized against other nations, but this plan was a total failure and now there are zombies that get smarter thanks to the radiation. Another nation decided to do the same but inject some sort of parasite into the zombies to kill them, but it just made them stronger and more united. As a last ditch effort, the remaining people decided to create domes to protect themselves from the radiation and the dangers that inhabited the wasteland. Eventually, the domes became infested and humanity was almost extinct. The remaining humans went crazy and became escaping the domes and becoming raiders, scavenging for anything they could find. Although, you are the last sane human on Earth. You, sadly, cannot trust anyone and must survive in this desolate and long lost world. If you want to, you can bring back dinosaurs from the dead and use them to fight said raiders, or maybe the zombies, or even these unknown creatures that some people call "parasites". But, lets accept it, this world is a lost cause. Escape this world filled with things that will kill you on sight and explore different solar systems and find a new planet to call home. Whatever you do, just don't reflect upon yourself, you might start remembering things you shouldn't from your past. Some things, that will make you depressed. The realization that you are alone, the last sane human, if you can even call yourself human. The realization, that you are the last sane human for a reason, that quite possibly, you are the one who started all of this apocalypse, and maybe the one who might finish it...

Good luck soldier... Hope you find a new planet to call home, or at least die trying.