Herein lies the inner battle of the existential question. If we exist, and then choose to become, how can one withstand the ever closer March of the impact of societal constructions on the self?
This is no easy reply. For in order to make "true" choices within the individual self, we must shed the affect and imposition of society (think Neitzschean UBERMENSCH). However, in order to make impactful choices within our current social climate, it is necessary to lean on, cooperate with, and help raise (or raze) our fellow citizens.
The contradictory nature of my statement above is, I hope, evident. I have begun to see existentialism similar to the consummate Cartesian problem, I think therefore I am. This problem is artificial, and self reciprocating, thus it does not a purposeful argument make. Instead I attack each day, choice or action with the basic existence and essence framework, and allow for that thought to best guide me down my given path.
Don't know if that helps or illuminates in any way. Great question!