All right here we go,
So, I was born because a witch placed a fragment of her soul in the corpse of a child, because she wanted to be a mother but was incapable of giveing birth, However, that child was male, and the witch wanted him to have a personality all his own, so when she made the transfer she... Locked... some of her own personality away in the deepest depths of the fragment. Not only did that make it extremly difficult to feel the emotions connected to that personality, but eventually that locked away personality began to rise on its own. And now it takes control sometimes, changing my body and acting like it's an actual person.
It's a pain to be honest. Now it thinks it's its own person.