I wonder how many of these lists are created as a result of insecurities or a lack of knowledge of one's self or even both. Even more so, misconceptions can be caused by a misunderstanding of the actual functions or preferences. I'd say E/I, T/F and J/P are blurred for a lot of people because of the demands of society placed on people.
Natural P types forced to take on J qualities to meet the daily routines of everyday life can become confused about themselves. Introverts are stated to be just over half the population in a book I have according to a recent study within the last few years. However, the majority of those introverts are ASKED to act more extraverted because extraverts and insecure introverts think they should be more drawn to the external world. The Thinking and Feeling preference can even be confused due to the demand on socializing, which would mostly fuel Fe.
I just get frustrated when people equate introversion with shyness. Introversion has NOTHING to do directly with your social skills. The only reason it has ANYTHING to do with it is a lack of time spent refining social ability due to being drawn to your own thoughts. It's a mental process, not an emotional reaction to socializing.
I wouldn't put myself as any type other than ISTJ. If I all of a sudden found myself as another type, it would likely be ESTJ or INFP temporarily. I force myself to act more ESTJ often in order to be more productive, but I'm fairly certain that I don't share many attributes with the natural ESTJs. My ESTJ moods are just toning down Si, and putting Te into overdrive for the sake of productivity. ESTJs direct their judgment with Te without deliberation. I couldn't live without deliberation. It's not that I think it's the most effective. It's just that I don't know any other way to operate.