Why not you?
When I used to audition, this thought was almost never present in my head - "why not me?" In fact, my thoughts were more along the lines of "they almost certainly won't pick me". To some extent, this becomes a self fulfilling prophecy.
I am not pretending that positive thinking will overcome marginal talent, lack of preparation, or sloppy execution.
What I am suggesting is that if you are a talented, well prepared young artist, your belief that you should have the position you are going after will transmit to the people hearing your audition.