Possibly Pica Pica
It was only a short period where it was so easy for them, but it was also only "surface" emotions. Obviously they really had no idea what was going on in the deeper recesses of my mind, but my outward emotions were easy for them to read. No one else that I knew was that easily read.
I was only curious if it was just and that phase in my life or if more went through a similar period. Unfortunately, I think it also only served to further push me into my shell. In High school it seemed every female could do it.
While extremely rare today, every once in a while someone will come along and be able to do it, always women. Thinking back about the ones later in life, at least one of them may have been an androgyne (almost positive). Odd to think that because I did not spend a lot of time around her, but there was a connection there. Her husband may have been as well, not sure why that occurs to me only now.
This woman definitely knew something was different with me even though at this point in my life was when I most repressed who I was (during my time in the military). I repressed it so much that I started to think maybe I was normal after all. That self image started to fall apart a bit later, and had I stayed in the military someone would have figured it out and then who knows what would have happened. Towards the end of my career they starting to question things about my life. Lack of girlfriends, sex, attitude...
I thought I was fitting in but in the military, you spend so much time together and depend on each other, eventually you get to know everyone quite well. We often knew each other better than our families/wives did. Sometimes apparently better than we know ourselves.