Confidence is more than an attitude. It comes from knowing exactly where you're going, and exactly how you're going to get there. It comes from acting with integrity. It comes from a strong sense of purpose. It comes from a commitment to take responsibility, rather than just let life happen.
Confidence is compassionate and understanding.
It is not arrogant. Arrogance is born out of fear and insecurity. Confidence comes from strength and integrity. Confidence is not just believing you can do it. Know that you are capable of accomplishing anything you want, and live your life with confidence.