To dream that you are a princess indicates that you are realizing your full potential. However, there is still more growing that you need to do. It is also a symbol of youth and mental development. Alternatively, the dream may mean that that you are too demanding. Or that you are too use to getting your own way. Perhaps you are acting like a spoiled brat. 

To see a princess in your dream represents the object of your affections or desires. 

If you are male and dream of a princess, then it represents your sister or an important female figure in your life. Perhaps you feel you feel that you have come to save the day. It also suggests your desires for the ideal woman.