I Am a Wandering Monster

One day I was just a stray cat minding my own business—until someone insisted I was a demon. Fine, you've got the bigger fist, so demon it is. But then they demand I become human instead? Okay, I'll play along. I work hard, build a reputation, and finally start thriving as a proper human being... only for someone to drag up my demonic past all over again. All I want is to live a normal human life. Why is that so impossibly hard?