They're telling us that just about everything we take to be real about ourselves, "real" in the sense that we think we are always experiencing undeniable truths about our bodies, our stories, well, that's just not the case.
Nos está contando que todo lo que consideramos real sobre nosotros, “real” en el sentido de que pensamos que siempre estamos experimentando verdades innegables sobre nuestros cuerpos, sobre nuestras historias, bueno, no es así.