Arrogance is sometimes mistaken for confidence. Arrogance is the notion of being somewhat confident with a leaning toward elitism, bragging, being macho, showing off, etc.
Example of confidence: Arnold Schwarzenegger and Sylvester Stallone. These guys do not go around with puffed up chests and think they are better than everyone else. Instead, they have a calm,quiet,powerful confidence that comes from an awareness of their abilities.
True confidence does not need to be stated. There is no need to brag about one's accomplishments. Those who brag are only masking their insecurity about themselves. Allow your results to speak for themselves. Actions speak louder than words, so take your confidence and make it happen." by Kent Sayre