wow, thanks. this is exactly what I hoped for when I put this here.

yeah I am oversensitive to any signs of possible rejection.

it wasn't the woman though. she was older, married and also had no important position. she looked at me when she talked and was willing to include me. but the man then turned his back on me and stood between me and her and I couldn't hear what she said.
I was rather sensitive to that gesture and it is sort of tricky for me to decide to stay there when I feel someone isn't interested.
anyway, generally you're absolutely right!