The first bit of awareness is not that you are thinking. It is of something. Something in reality. You sense first, then you think. It takes a multitude of sensations before you can have thought, or the manipulation and integration of concepts. As such, the very first statement, if you will, or thought you can make or the base of all cognition, epistemology and therefore philosophy is not 'I think therefore I am', but 'there is something I am aware of'. This entails an existent with identity and a consciousness to be aware of it. Existence comes before consciousness. There is one reality and we perceive it. Our view is subjective, but the world itself is not.