You are a spirit of (something). Everything has many spirits of that thing. They act as the gods of this world, their existence holding the reality of that thing rather than creation. You can either live in the spiritual plane or in the worldly plane. Every spirit can travel between them.

You are currently in the worldly plane. It's modern times, though the human population knows for a fact the spirits exist. The spirits do not usually want worship so they just coexist, rarely ever getting involved with each other. Though, some spirits like to pretend to be humans.