Whenever someone says hi (or any other greeting), and I'm not expecting it, my response sounds all high pitched and little-girlish. Then of course, since I'm embarrased at how stupid I sound, I'm afraid to say anything else, which just makes the situation more awkward. Or if I'm in a social situation that is causing me anxiety, I'm focusing so hard on appearing calm, that I'll say the opposite of what I mean (for example: "hi" instead of "bye" or "you're welcome" instead of "thank you"). Does this happen to anyone else?
When someone says something that I'm not prepared for, e.g. they speak to me when I'm not looking at them, I always end up saying something semi-weird. It sucks when I don't have time to premeditate my answers.