I'm not sure how many people suffer this particular variation of social anxiety, but yes, it is a thing that not merely you and I are on occasion afflicted with. Actually, it's an entire category of things that a number of things suffer from, even if I'm not entirely certain the more pathologized description suits your situation, but whatever. People get fucked up and nervous about how to interact with other people, because interpersonal relationships are really important on multiple levels, and whether you call it social anxiety or just getting unnerved, it sucks.