I know what you mean- I am like that, or used to be, still am a little. I think for me when I came up against someone who was a conversational brick wall, or who couldn't see my side, I felt powerless to get my thoughts and opinions out clearly, because I didn't have enough verbal/social skills, and mostly, I felt that I was not important enough to persist, and that made me angry, and I thought I was angry at the other person, but deep inside I was angry at myself. Hope this makes sense, it took me quite a while to figure this one out. I really like the responses here, very enlightened, helpful info.