Subdivision.

As I write my ventures into fiction more and more everyday, I find myself feeling subdivided. The current work I have has a very large cast and is told from multiple view points, and I have consciously tried my hardest to step into each character with their own voice, their own being, and if I'm not feeling a character, writing doesn't happen. Its a state of mind, but I begin to wonder, when does the creator end and creation begin? Sometimes I feel subdivided by these characters, as if stepping into them have made some persona for my brain to step into, more chaos in my head. Sometimes I feel like I have this Juliet of the Spirits door inside my skull that they all enter and exit through on their own accord. Have I spread myself too thin? Where am I amongst these fictions?