As an athlete, success is not just about winning; it is about working hard and giving it all you have. I have always taken one match at a time and worked hard; when I succeeded, I worked further on the aspects of the game which worked for me; when I failed, I listed out my weaknesses and worked on them.
A fit body gives you confidence. And there's nothing more impressive than a great attitude, which you can wear on your sleeve. But you'll have to remember the difference between being rude and being confident.