You killed yourself the second the apocalypse started because you didn't want to fight to stay alive. As you wandered the streets carelessly walking past the zombies you let out a small sigh when you saw a teenager your age looking at you, you didn't seen no survivors in weeks

"Who the hell are you?!"

He asks looking at you with wide eyes, obviously caught off guard by the way you easily walked between the zombies, he didn't seem to notice you were a ghost yet.