Awareness of oneself — the mental awareness of one's own existence, actions, or traits; can also mean being self-conscious about how one appears to others.
彼は自己意識が強くて、人前で話すと緊張する。
He is very self-conscious and gets nervous when speaking in public.
思春期になると自己意識が芽生え、周りの評価を気にするようになることが多い。
During adolescence self-awareness often develops, and many start to care about others' evaluations.
自己意識を高めるために、自分の長所と短所を書き出してみた。
To raise my self-awareness, I tried writing down my strengths and weaknesses.