In my most recent LD I decided to go flying, as it was my first lucid dream with control and awareness. I walked out back and took off, (It was strange, 3rd person point of view to a degree) but I was flying. I landed, and a DC girl with a basket told me that I can't fly, because flying is impossible. I said "Just watch me" and tried to take off, but couldn't.

Was this because I believed her, or was I just thinking TOO logically?