Self-awareness allows you to recognize and accept your weaknesses, while focusing all of your attention on your strengths. It helps to overcome the ego and to gain peace with yourself and your skill set. There are only few things more liberating than knowing who you are, why you do what you do, and not apologizing for it.
If you want to get to know yourself, you need to spend time with yourself. Not walking a dog, not playing with your kids, not jogging, not cooking, but being still, going inside and having that conversation with yourself about yourself. Take time to audit who you are, see the good and the bad, and be your own best friend.