Confidence is an important attribute to have. If you feel you lack this attribute, you can always work on yourself to be better. To build confidence, you need to practice and put in conscious effort.
First, you most like yourself, believe in yourself. Believe that you are good enough. Do not look down on yourself.
Nobody is perfect; no one has everything figured out. So do not see yourself less than anyone. Learn to compliment yourself even before anyone else does the same. Learn to declare positive affirmation about yourself.
Recognize your strength and horn your skills. This will make you exceptional and help you build self-confidence.
Lastly, face your fears; learn to do things that scare you every day. Do them in small bits, and with the time, you will have confidence in those areas.