Living in a dead world

It's been fifteen years since massive zombie virus outbreak, world isn't the same place anymore. Death, sickness, lack of food or water... only the toughest ones can survive. These harsh conditions make it barely possible to still maintain own sanity and humanity, but isn't being "normal" in such world just being a weirdo? You live on your own, you try to maintain sanity while there are gangs, murderers, cannibals, devilish cults, mad scientists or even worse... You can survive in such world, but what for and at what cost? Try yourself in survival setting where your humanity will be tested at every step