Aristotle once said that "Knowing yourself is the beginning of all Wisdom".
Being self-aware is about knowing yourself. That is being aware of every given moment is the essence of being alive, being 'present' in one's own life, and by taking charge rather than being constantly stuck in the past or fearful of the future.
Being aware of one's feelings, of one’s emotions is the first step to taking charge and 'control' in making conscious decisions as opposed to having life pass you by, living in a daze, being on 'auto pilot' or even reacting blindly.
The old habits of reacting defensively and retaliating without thinking, without assessing the situation leads to the turmoil and pain.
To be grateful for another day of opportunity, to make better choices, ultimately leads to a better quality of life.