Purpose is really just actualised meaning and just like meaning there is no purpose in life other than that which we make. The reason that most people are looking for meaning or validation and something, anything at all to provide a goal or trajectory around and as which they might wrap their aspirations and goals is that there is none. We seek meaning and purpose in ideas, ideologies, cultural cliques, constructive (or self-destructive) assertions of self-definition and behavioural or cognitive pattern and experience because there is none.
Someone might argue that this search for purpose and meaning precisely is the purpose and meaning of life and to be honest I am certain that there is any point or value to be obtained from challenging this position. We inhabit an expanding space and yawning void that opens up here between experience and the symbolic abstractions of goals that we must cultivate or adopt from prefabricated bundles of words and ideas which came before us.
There really is no purpose in life beyond that which we make and all of this human angst and anxiety is really just so much hot air and bluster. In a thousand years, none of us will be here; in a billion – no traces of any of this life we cherish will remain. Make your meanings, seek your purposes but know that they are always only ever as transient as we are so don’t get too hung up on them. This, too, shall pass.