My therapist would never comment on my body language because she said it was way too hard to read, that just conversing with someone and using words was hard enough without going non-verbal. I think you could be misreading people; you can't really know what is behind their looks, what they are thinking and feeling -- it can be like Scrooge in "A Christmas Carol" where he decides the ghost of Marley is a bit of undigested beef? Someone happening to make a "pained" expression when talking to you, that expression may have nothing to do with you at all.