When you are facing a task or a project, you have no question in your mind that you will succeed. You can look people in the eye or express your thoughts without fear.
Your confidence level may fluctuate on occasion. An argument with your spouse or a bad day at work may cause you to feel off balance. If you have an overloaded schedule and have difficulty meeting your obligations, you may have periods of self-doubt. On the other hand, solving a problem you've been working on for some time will cause your self-confidence to soar.
Believing in yourself can open doors for you. Lacking faith in your ability to handle situations occasionally is normal. If you find that you doubt yourself more often than not, consider working on improvement.