I remember two years into my transition in 2008, many people often claimed to be never to be able to tell in occasions they found out I was trans (mainly in LGBT settings), whether this was said out of politeness or was genuine, I could not ascertain with certainty, but it did buoy my confidence. However, I remember at one friend's party, somebody approached me and asked "are you a trans...vestite or transgender? I could tell straight away..." and it turned out she had issues about considering transition, etc. At the time, I was devastated, I wondered what had given me away, whether it was my body language, my adam's apple (this was pre-trachea shave) or whatever, and I remember going to a room and crying for about half an hour. I remember thinking that I had gone through all this heartache still to be perceived as a ->-bleeped-<-!
However, it made me think about WHY I was upset, and what the real basis was, and it was based on a lack of full acceptance of myself. I believe it is much more healthy to embrace the experience you have. That doesn't mean to say you have to be trans, out and proud, or consider yourself a different kind of woman, or anything like that, I realised I was still as female as any other woman if I wanted to be, but I had gone through this metamorphasis and experienced life as two genders, and it has shaped my gender and womanhood, and more than gender, I am simply me. Once I had come round to this way of thinking, it was irrelevant if people saw me as trans or cis, I was me, a woman, irrelevant of perception. Since then I only had one other experience, around three years ago, and since then, I haven't again, and while the majority of people may never know my past, there may always be somebody who could have somehow sensed it.
But whether they do or not, it is irrelevant to me now, as having confidence and acceptance of being unapologetically yourself projects on others and convinces them to treat you with respect, and see you for what you are. This is far more important than them knowing your biological history. In fact, I don't go shouting it from the rooftops but I have been open with some people close to me because it felt liberating for them to know my past and what I had been through, and why I am the way I am. Of course you may experience prejudice from people when they 'find out', but who wants to associate with such people anyway?