For most people, this probably isn't something noticeable, but I'm not used to caring what other people think. I've always just done what I thought best, without worrying about others' impressions. I'd be nice and polite, but if someone was offended by, say, my going barefoot, I didn't care. Now all of a sudden there's someone whose opinion of me matters.
I've always been bad at catching subtle cues. It never seemed important before; if someone couldn't be bothered to tell me I'd done something wrong, I couldn't be bothered to care. This isn't true anymore; I'm always worried I said or did something wrong and didn't notice.
My fears are probably groundless, and I know that... but that "probably" is a killer.