If I understand NPD, then those with the disorder actually have a fragile self-esteem, but they cover it up by acting superior, and by putting everyone else down. They tend to be very sensitive to any type of criticism.

If you scored high on the test, then it is certainly a possibility that you have the disorder. Have you considered seeing a counselor about it?

Another thing about most NPD's is that they have had very tragic childhood's. Either there was a significant amount of abuse and/or neglect, or they were just spoiled rotten somehow (which itself is a form of abuse, and not something the victim is responsible for).

NPD is almost certainly a reaction to problems caused by a problematic (traumatic, terrible, abusive) childhood.