My brain is a strange organ...the more I exist the more I question

How do u know ur beliefs r real? Do u lead ur own life or is it a repetition of wat generations have been doing 2 survive 4 billions of years. Do we control our own mind or is it controlled by other forces. How do u question if u don't kno if that question exist in reality, what is reality, is ther one? what wud happen if u followed your subconscious mind? Wud it change who u r? how do we even kno who we really r if we cant read our entire mind and thought clearly?