======= Date Modified 06 Aug 2009 23:08:58 =======
I have read about this sort of feeling many places. It is quite natural for many phd students to feel this way. A fraud. Even I feel this way sometimes. It will wear out with time, experience, and getting into one's comfortable zone.
Best of luck for the postdoc. You have something that many others wish to have. Make the best out of it. And try to conceal your feelings. Always put up a confident front. It works. People love and are attracted to confidence. And suddenly, even if you screw up (which will happen from time to time taken you are human), it won't feel any bad.