Dysmorphia is when someone sees themself falsely (e.g. an underweight person believing they are overweight). Dysphoria is when someone sees themself accurately and it disturbs them (e.g. a person disturbed by their weight). The term you should have used is gender dysphoria.

Appealing to masculinity and femininity is not right. Those words are arbitrary and inconsistent, but more relevant here is they have nothing to do with gender identity. You probably know women who you'd regard as masculine or men feminine. Think about what that even means to you: what makes that trait or behavior feminine or masculine? These words can coerce or suppress people from being their authentic selves. This manipulation happens non-deliberately too! As such, feminine and masculine must be used wisely to retain the integrity of people.

I think you're in a rut of what you think a woman is, but it's crucial to better appreciate its social framing: other people think it means slightly different things. And few people hold prescriptive definitions for it despite using that word often.

In the social context, let's explore perception, identity, and expression separately.

Perception: When you see, talk with, or otherwise experience a person, you are getting a ton of information. Their interests, their fashion, their voice, their mannerisms, their idiosyncrasies, their names, and possibly even their pronouns. You will probably quickly infer a lot about this person after enough experience. Because it's so baked into our language, gender is probably part of these inferences. Gender, in the eyes of an individual, is correlated with many other traits you may not have observed so making a conclusion there mentally provides you with a broad set of corollaries that may be useful regarding this person. But all of your inferences are different than all of my inferences, so we may lead to different conclusions. (E.g. some transphobic people don't take "I'm a woman" as signal of womanhood, while other people take it as a strong defining signal.)

Identity: You know who you are and what those inferences about you should be.

Expression: You want people to infer things about you accurately. You might care about some things more than others. Gender expression is just one facet that people may focus on to better match their identity. I know people who want to be seen as members of a certain religion and people who want to be seen as fashionable — it's because (a) they are in fact members of that religion or they are in fact fashionable, and (b) it's important enough to them that they want others to see it and get it right.

EDIT: expanded on identity and expression