I feel exactly the same. And it is obvious to myself, but I have realized that I must let other people know this, since many people are much less stringent in handling certainty, confidence etc. A gross oversimplification: some people seem to throw confident statements of facts around just to see what sticks.

Regarding introversion and fear of social consequences, I am definitely introverted but have been told that I speak my opinion too much sometimes, so I cannot agree that introversion is related to fear of making statements other may object to. In my case at least.