Consider it like this... are you in control of your body? No, not 100%. You have some adminastrative privalages over the body, but generally speaking, your the passenger seat driver.
What does the brain do exactly? It observers a universe of math through our senses, and stores that data within the neuron cells. We exist within the neurons of the brain. That information is than used to form models of how the envrionment outside works, and allow us to make predictions, and anticipate situations. As neurons, we use this data, and then control the body using electrical impulses which control the muscles. Basicly we are clever cells which learn to control the body. This is why we can so easily relate to other mammals and animals. We are all neurons. We just have a larger network of them.
What's more, when the Human bod dies, is it the heart thta kills it? It's the lack of oxegen to the brain. To the neurons.
When one says "I", they generally choose to speak for their entire individual because this is the social term most commonly necceary within today's society, and the exchanges between other Humans. But, in truth, we as an entity. The thinking individual within us exists within the mind. Within the Neurons.
Say hello to yourself
Well, there are over 100 billion neurons in your brain, all connecting with eachother, so perhaps I should say.. say hello to yourselves? 
