Wow... I've never had this happen yet. And I've been out for quite a while, and am full time / HRT so on. I always tried to fit in, and well, I got that good at it that no one would even think I was strange or different. I hated being around too many people, I got confused and couldn't keep up a very convincing persona, even if I knew these people, or even if they were my family. But around smallish groups, of like 5 - 10 people or so, I was alright, and I would fit in, except times when I would just stand there completely blank. But hey, what are ya gonna do? lol
Now, I happily can sit in a room full of people, and listen out for keywords, and hear something interesting and just join in the conversation

Gosh I love being me, and female (Female is me, but I wanted to state it) because socially, it's not abnormal for a female to participate in an open conversation of her choosing. ^_^