I kind of understand what you're going through a lil better now.
Today I was approaching a door but there were 2 guys in front of me. They got to the door first and opened it, and let me though. I said thanks, and one of the guys gave me one of those "looks". It was very difficult for me to understand how he couldn't see I'm a "guy". I mean, here I am, work clothes and zero makeup.. about 30 hours since I've shaved, and a guy is looking at me with a smile I never get from straight guys. I kind of smiled and walked by him tucking part of my hair behind my ears.
It's really hard to believe you'd pass when you've NEVER, EVER been thought of as female. I mean, for 25 of my 30 years, my perceived sex has ALWAYS been male, so when I look in the mirror I see all the features that make me look like a guy. But apparently HRT has changed enough to make that very questionable on good days.
And btw, when I walked out of that building again, some guy sitting in a van yelled out "Hey girl!". I was the only person in the parking lot and I was about 75 feet away, so I know he wasn't talking to anybody else...
Anyways, just letting u know that I know how you're questioning things right now, but honestly I think the guy thought you were cute.