LOL of course not! You asked why people might think you are a woman when you are not so I made some suggestions based on what you've told us 😂
Really, until you start being honest about your sex, you won't know if the people you meet think you are a "woman" because they sense your innate non-physical womannyness, or if they think you are a "woman" because you use cultural tropes that they assume mean you are female and would not in fact consider you a "woman" if they knew you are male, or even that they do not in fact think you are a "woman" at all, but believe your presentation choices mean you would prefer for them to address you as if you were.
These tropes are not just clothes, but your choices of name, hair, makeup, mannerisms and so on, not to mention the obvious sorting hat of walking through doors (doors both literal and metaphorical) which are marked Women-only.
Now in case there's any doubt (or a bad faith pretence of doubt) I do not believe cultural presentation tropes like the above should be reserved for female people. I'd much rather a world where people can enjoy the styles they are drawn to without these having any connection to one sex or the other at all.
But I also recognise we are not in the world, so as with so many things Feminism needs to be concerned with, I can hold in my head, think rationally about and work to improve both what is true today for women and men and what might be possible in future for us.