Hello everybody! my name is Michelle im 22years old and im a MTF transexual. Im from Bolivia but i live in Sweden so my english is not the best

aah also.. this is my first post

I have been on estrogen and spiro for 7 months and i must say that everything is going pretty well, the changes are bigger than i expected and im passing atleast 85% of the time.
I work at the airport as a check-in agent for different airlines and that means that i meet alot of new people all the time. I havent told my collegues that im transexual yet, they know me for my old name because i started at that job at the same time i started hormones, so they just assume im a VERY femenine gay guy.
We have uniforms at my job, and they are quite similar, some girls have skirts and other pants, guys must wear a tie and girls a scarf. Even dough i wear a tie i get called for "she" by almost all the passangers everyday, i even get compliments and some male passangers have flirted with me very clrearly, lol there is even this guy that hits on me very often that works at the airport and he doesnt know im ts.
What bothers me is that there are still some passangers that call me "he" most females.. and it hurts so much! i just dont know what the reason is? im still working on my voice.. and i get called she most of the time so i guess its quite convincing.. so i wonder if it could be the uniform? i dont have a very masculine face and i wear discret makep so i really don get whats "revealing" me?
Have you experienced this before?