Set your mind at ease Maggie.... young transitioners have no easier time 'reading' anyone than... well, anyone.
As for the guy,... Men look at women. It's normal... It's probably more ethnic than gender... and a bit of 'ew teh gay' syndrome possibly? that or he fancies you

That sort, as you said, would be quick to say, as they havent .... take it as a good sign. Anyway, actually, the more time you spend with people, the more they see you, not a random by thier features. The more they know you... the more your image as a woman is cemented in thier mind. The less likely they are to see something... hear something in what you say? or do? sure, but if they dont work it out by your apearance pretty fast... the chances fall incrimentally.