That is often a dellusion of the rational mind for most people. I found that a lot in Wiccan communities where women expected to be found attractive by others people just by feeling attractive. Other people feel that they are classy, entitled people, but they are actually gross and uneducated. Some other people feel that they are winning the prize this time, and they lose. Some other people feel that they did enough, and their projects fail, and so on.
It depends on your current and specific workings you are doing, also, a great percent of your success has to do with yourself, specific characteristics of yourself, which would make the difference in comparisson with someone that is not that succesful with the same current and/or workings, but as there is an overall sense that everybody is the chosen one and deserve legions to conquer the world, people often overlook that aspect. Magick is like any other activity, some people are great at math, and others aren’t, also, most people forget the correct difinition of the word “magick” as presented by Aleister Crowley, which not necessarily has to do with psychic powers