Gender systems can affect what personal experience of one's own gender and how they fit in society?
Gender identity Gender identity is one's personal experience of one's own gender. Gender identity can correlate with assigned sex at birth, or can differ from it completely. All societies have a set of gender categories that can serve as the basis of the formation of a person's social identity in relation to other members of society. In most societies, there is a basic division between gender attributes assigned to males and females, a gender binary to which most people adhere and which includes expectations of masculinity and femininity in all aspects of sex and gender: biological sex, gender identity, and gender expression. In all societies, some individuals do not identify with some (or all) of the aspects of gender that are assigned to their biological sex; some of those individuals are transgender or genderqueer. Some societies have third gender categories.
Womb and vagina envy In feminist psychology, the terms womb envy and vagina envy denote the anxiety that many men may feel caused by envy of the biological functions of the female sex (pregnancy, parturition, breast feeding). These emotions could fuel the social subordination of women, and drive men to succeed in other areas of life, such as business, law, and politics. Each term is analogous to the concept of female penis envy, derived from the theory of psychosexual development, presented in Freudian psychology; they address the gender role social dynamics underlying the "envy and fascination with the female breasts and lactation, with pregnancy and childbearing, and vagina envy [that] are clues and signs of transsexualism and to a femininity complex of men, which is defended against by psychological and sociocultural means".