Many people tend to confuse self-awareness with consciousness, while these two are quite different one from another. Self-awareness is having capacity for contemplation, self-examination and even meditation.
It means having a clear view of your own personality, which includes your strengths, weaknesses, beliefs, motivational reasoning, emotions and thoughts. All of this allows you to better understand other individuals, in order to "get" how they perceive you, your personal character, attitude and your reactions to their actions in the given moment.
While developing self-awareness you become able to make changes in your own thoughts and clarifications, interpretations, perceptions and the meaning you make of something in your mind. It's the first step into mastering your emotions, reactions to other people's actions, and other attributes which directly affect your decision-making trough life.