I am who I am because of what I physically am, namely the unique genotype and phenotype resulting from genes and environment ("nature and nurture"). That's why I am not somebody else.

I mean why are you in your body and not someone else's. And I don't mean physically either.

That definition would essentially be the brain, both conscious and unconscious nervous systems. I doubt that's what you meant.

No, I mean being aware. Not to turn this religious but the Soul, or maybe something else (btw I don't believe souls are religious) It's really difficult to explain, I honestly doubt we're just a brain. Basically how do "you" control the brain.

Which brings me to another question. How come you can't control the thoughts you're thinking?

Also when you're thinking about something there's a picture on your mind but when you try to concentrate on the picture it's gone. Why is this?

I mean why are you in your body and not someone else's. And I don't mean physically either.

Considering our physical makeup along with our gathered experience is what makes up who we are i don't see how that question makes any sense.

That's like asking why your eyes aren't in someone else's head and not mean it physically.

Basically how do "you" control the brain.

Try thinking of consciousness like an image on a computer screen. The image you see is an emergent property of the of each pixel in a certain order. Our the various functions of our brain are like those individual pixels. Alone thy don't make up the consciousness (the picture) but together they do.

Also when you're thinking about something there's a picture on your mind but when you try to concentrate on the picture it's gone. Why is this?

I don't have this issue.

I mean why are you in your body and not someone else's. And I don't mean physically either.

As Mage, I don't see much point behind that question. It is flawed as you automatically assume there's more behind the physical selves. My point was exactly that there isn't, and doesn't need to be to explain consciousness.