Feet are the representative of human movements. In my dream, wearing shoes that don't fit me represents my subconscious performance that things are not going well.
Other effects:
People in love will dream that they are wearing shoes that don't fit, which indicates that something will happen to their love. There may be a third party interfering with your love.
Students dream of wearing shoes that don't fit, which indicates that their grades will improve.
Businessmen dream of wearing shoes that don't fit, which indicates that their career will improve soon.
Job seekers dream of wearing shoes that don't fit, which indicates that they will not find a satisfactory job for a long time.