Carly,
I looked at your photobucket pic and you definitely pass. From a transgirl to another, I say you pass you definitely do pass even from a distance or a close look. I'm 4 weeks going into HRT and I do not have boobs yet. I'm older than you are I'm in my 30s. I could pass because I'm built like a little girl since I was small, that is my advantage, but not everyone's standard. You can definitely pass on many levels. But I still sometimes get mistaken as sir on the phone or sir by non-Americans (sorry I'm not racist, I do see people not from the US to be more observant of people's gender and they can tell who is guy in that dress) I have cases of middle eastern and pakistani people call me sir even when I told them I'm transgirl.
Who is it in society that is not allowing you to pass? Do you pass in the women's restrooom.
Sometimes, its all in the mind and the vibes we send out. You don't need to be flamboyant, just be yourself and the feminine beauty will show and that will pass. Just be careful when men start noticing because they can sense the feminine scent we transwomen give out and some of them get turned on by that and that gives them catcalls to us. Some men are ok with transgirls some are ignorant, just be careful. I ignore men I do not know.