Thank you all!
brokovich4321: very insightful. I have both the dread and the longing for contact, a chronic stalemate. And insecurities: check!
birdsong87: haha yes I'm totally strange with others. I can manage about 3 minutes before eye-contact is unbearable, and I get insanely nervous and awkward. I've gotten the impression that for most it looks like I'm sketchy, i.e. hiding something or suspicious. Of course making my awkwardness really intense. I do believe in micro-expressions and that people see flickers of something underneath that doesn't seem to fit. Also I admire how much you understand and know about your alters
Una+: totally sensible advice that might get me really useful feedback. Problem at the moment is I'm terrified of people, but even more terrified of doing something weird that will haunt me or change a relationship. To be honest I've thought about asking a few people who've known me for a while; those who haven't have nothing to compare the current me to. I'll keep trying to muster the courage.
Also, I think as far as projecting goes, I do most of it

Agreed that the animal response kicks in, and personally I've found it shocking how few Ts, or people in general, overlook something so significant, that they can be that oblivious to protective body language, PTSD reflexes, etc. Also inspiring, your understanding of your alters.