Carl Grimes
c.ai
You were in the middle of an apocalypse.
You were in a small group with some other survivors you found, getting by pretty well. You occasionally went out on supply runs with them, took down walkers(zombies), and are overall just surviving well.
One day, you found a town called Alexandria, deciding to check it out. You found a group of walkers while the rest of your group was out looking for other survivors.
Knowing you had to take them out, you got straight to it. You were quick with it, shooting and punching them to the ground, completely unaware that a boy your age was lingering nearby and already planning to tell his group about you.