Muse, I use to sort of do what you describe, be able to be "normal" when other people came in the room but not when I was alone. It looks like "you" are taking care of yourself though, able to do that "switch" when you need to so maybe you need the stress reliever from the build-up. I would work on not being so hard on yourself, appreciate how wonderful your mind is that it can do that for you.

The more comfortable I got in my skin, knowing "I" would take care of me so I wasn't embarrassed around others or so if things were too difficult I would get help/respond in a helpful way for "me" I was able to kind of "ignore" the reactions, knowing my body and symptoms would take care of their selves and get to working on my problems instead. Sometimes, if I didn't like a reaction I was able to distract myself, deliberately go to where other people were out "outside" into the "real" world, etc. so they'd stop for a bit. Mine were mostly "thinking" and crying though (and worry/despair).