I, me, myself

All the time I am thinking of me. This lead me to browse through (the initial few pages of) Douglas Hofstaeder's 'The Mind's I'. I picked up this from there.

I have a body. I have a mind. I have a brain. So what am I? What does this 'I' point to? We say I have a brain, and not I am brain. So what does this I mean?

Simple?