We maybe can have (emerging) existential moments in which we are different from what our role expectations prescribe us to do. Role expectations caused by the respective structural arrangements and the general social systemical functional logics – and maybe behind that the ‘fabric of the social space’ [in reference to Brian Greene: Fabric of the Cosmos]. In a picture: Maybe we can add annotations/readers’ comments to the pre-written pages of our lives.
But on the other hand the structuralist spoilsport can say: If “too many” people have “too many” existential moments of individuality (individually composed moments of slight ownness/originality, or only a little non-following of the systemical demands/functionally established patterns), then society/the respective social contexts will break down. So, in this perspective: Keep up following the script, don’t leave the role, do/perform the roles/work/character patterns which the structures have (structurally, structures aren’t a conscious actor) pre-chosen for you in life. Meaning: Your invidual composition and what the respective structural contexts you were socialised into made of your basic character potential pool.
This perspective on life may be a re-narration of the world as determinist without any meaning behind/beyond our (often superficial) communication or actions.
Existentially on the other hand: Whatever there is. We may forecast some pattern predicitions on the scale and level of technical developments. And we may know the human-historical repeating patterns of group behaviour. But the individual world, our individual interpretation of the structural and contentual things that are presented to us by the (natural and social-cultural) world that is ever-moving and yet often just repeating in variants. We can not predict what people we meet, what aspects of which different structures will influence our lives etc. And so we have the freedom of not knowing what the structurally pre-determined life will present to us. And if there are moments of positive surprise or honest communication (non-show and not one-sidedly role playing behaviour in communication) with another individual, we can enjoy that, to honour the moment.