Metacognitive Sensitivityis the term for describing how well we are able to judge whether we are likely to be right about something. Some people are much better than others.
"Metacognitive ‘sensitivity’ can be assessed by the extent to which an observer’s confidence ratings are predictive of their actual success. Consider a simple decision task such as whether a briefly flashed visual stimulus is categorized as being tilted to the left or right, followed by a confidence rating in being correct. The task of assessing response accuracy using confidence ratings is often called the ‘type 2 task’ (Clarke et al. 1959; Galvin et al. 2003) to differentiate it from the ‘type 1 task’ of discriminating between states of the world (e.g. left or right tilts). If higher confidence ratings are given after correct judgments and lower confidence ratings after incorrect judgments, we can ascribe high metacognitive sensitivity to the subject. Thus a simple and intuitive way of assessing metacognitive sensitivity is to correlate confidence with accuracy (Nelson 1984)."