Yes! As we become socialized from birth, we become used to a false notion that there is a essence to each individual, but really what is happening when one self-identifies is that one is relating oneself to others in a particular style.we are the fluid sum of all the causes and conditions that are in effect at any point in our lives. This explains why you are not the "same person" you were ten years ago, or ten months ago, or really, ten minutes ago!
Regarding gender, whilst there is no doubt that biological sex is constituted in all of us by multiple variables along a threshold. To put it simplisitically, "gender" has genesis in differing bodies based on pysiological/sexual generalisations. It is substantially internalized within us in socialization, where masculinity and femininity have no meaning apart from how they relate to eachother. We don't have a degree of gender within us, rather there is the capacity to identify and invest in notions of gender, to feel affinities with notions of gender, and to feel alienated by notions of gender...