I have been around this old word a long time, 24 years pre, 35 post and the vast majority of people are so wrapped up in their own little world that they don't bother trying to "read" others - that's a trans thing.
Cis-people know who and what they are and for the most part don't bother to try to act a certain way or move a certain way or use particular inflections. Whether 4'6" or 6'6", skinny as a rail or the size of a house, they know their gender, they know their sex, and they don't care what Joe Blow on the street thinks.
Now tran people seem to feel the need to pick everybody else apart, look for "tells" etc. and feel that if they mask the tells and act a certain way, follow a particular script, mime certain actions, they will "pass" as the opposite sex but they miss the essence and can be little more than actors because they don't have "the core identity".
For a girl/woman the core is built on KNOWING your a girl and you don't have to prove anything, oestrogen has already done "the wiring". Children, youth, and even adults socialize where they are comfortable and at ease and that is "among their own" - girls grow up learning from other girls, boys from boys, and that socializing and learning shapes one's personality around that core identity.
"Normal people" don't go around thinking how they should move, how they should talk, etc. - it just all comes naturally - and it is the overall impression that other (non-trans) people "read" subconsciously and in an instant. Anything that seems scripted or forced stands out like a flashing beacon and may attract greater scrutiny.
For someone changing their social sex, the more of your previous mind-set that you retain, the less you will "pass" because that comes through all the time. If you want to BE a woman, forget everything you know or thought you knew and immerse yourself in the world of women, become a child again, change "the core" and rebuild on the new core.