Neglect Your Cultivation, and You'll Be Punished by Marrying Your Brothers to a Fairy

I'm having trouble telling reality apart.

At first, I was in a post-apocalyptic world full of zombies, and I was infected while trying to save him.

Then I died and ended up in a cultivation world ruled by corporations. He had become a bionic human and told me that my previous life had been a simulation game that felt a little too real.

Later, I went mad from cultivating, and another him appeared, dressed in a suit, and told me that everything was a psychological test for joining the Paranormal Bureau.

Who am I supposed to believe?