Self-awareness theory states that when we focus our attention on ourselves, we evaluate and compare our current behavior to our internal standards and values. We become self-conscious as objective evaluators of ourselves.
Self-awareness can be an understanding of one's own knowledge, attitudes, and opinions.
Looking in the mirror provides a surface level view of oneself. While this is very valuable you often need the passage of time and an outside view to point to your internal self. Our look in the mirror is often clouded in wishes and it is hard to get by these internal filters.
These "self-awareness indicators" can come in pieces of time and words often not meant by others to shed light on oneself. If you can come to grips with these moments of time and not ignore them, you will become wise beyond your years – but I warn you – the path is often filled with shadows perhaps best left in the dark if you are not ready.