most people assume that everyone else thinks the same way too
Indeed - I think if more people realized that then we could adapt ourselves to deal with different people and difficult situations far better. It would probably incur more tolerance and patience with others - Its an interesting observation to see posts to peoples dilemmas where the "answer" is given - without taking into account the way a person thinks and in some cases - the way that they feel.
As for judging - no one can stop doing it. Its wired into us. Whether we want to admit it or not - people judge on every nuance of human interaction - on such a level we dont even realize it, and in turn our behaviour will reflect this.
We judge because its the mechanism that determines whether or not we like someone - as well as any number of characteristics. Its intrinsic and necessary to survive. The only thing you can do (and sometimes its not enough) - is to at least be aware that you are judging - keeping the knee jerk response to a minimum.
It is interesting to note that none of us like to be judged, yet are quite prepared to do so quite harshly to others. Acceptance is something we all desire, but I am not convinced of the relationship between judging others (seeing as its so natural) - and the anxiety of being judged. They are two different matters IMO.
Btw - I dont suppose anyone actually knows how to be more confident...?