I do a lot of second guessing when I speak, in fact I prefer to remain silent most of the time. I think it relates to PTSD because we were trained to believe that what we spoke was wrong and I personally was raised with the "children should be seen and not heard" type of parents. So if as a child I was given the message to not speak and if I did speak there would be consequences or at the very least invalidation that would explain some of my fear of speaking now. Another aspect is that I always tried to be somewhat invisible, speaking would bring attention to my presence. And my final thought is that survivors of trauma often have low self-esteem which leads them to question everything and be concerned about others reactions, what others think of us, etc. I don't know if I really answered your question or not....but I do the "double-think" almost constantly...like 2 different worlds - one where I'm interacting with the current situation and the other one in my head.