To dream that you are shrinking suggests that you lack self-confidence and self-esteem. You may be feeling embarrassed, insignificant or unimportant in some situation. Perhaps you feel that you have been overlooked by others. Alternatively, the dream may refer to a time were you were young and small and thus, symbolic of your childhood.
To see others shrink in your dream indicates their insignificance. This may also be a pun on a psychologist and your need to consult one.
To see objects shrinking in your dream indicate that they are not as important as they once were.