Purpose of life...?

Somewhere we all need a purpose for doing things.Perhaps being rational in approach we can not do things without having a self approved reason.Why do we live?Why does human want a purpose in life?There may be many sub purposes related to living life but the main purpose is nothing but living life :)Do you need a reason for letting your heart beat or your breath be taken out /in ?In fact had they not been the involuntary activities of body, human might have stopped or manipulated them too owing to own intelligence :)
What is living life....action and reaction syndrome or fight or flee responses ?Obviously not any of them.But still it is what rules lives of millions on earth.Can we celebrate the festival called life just for the sake of it as there is nothing else as important as enjoying our existence among all other splendid creations around.Very small acts and very small events can give joy to a mind at rest while those searching happiness in goods or relations are entrapped in a vicious cycle of pleasure and pain .Rarely a relation among two people is found to be peaceful and this is completely priceless but to find it both people are needed to be at peace.
As far as goods are concerned they can not give much saturation after fulfillment of basic needs.What they can do is to give birth to "EGO" to help one find purpose of satisfying it all the time and thus keeping oneself engaged to ignore emptiness inside that always makes one restless to achieve something unaffordable at present . It seems like trying to find a crow with seven colored wings that does not exist in reality :)