Writing about your life is important because it gives you a chance to reflect. Journaling is one of the main practices that therapists recommend for promoting mental health. It helps people manage anxiety, cope with stress, and deal with depression. When you maintain a journal and you go through your previous entries, you witness your memories without distorting the reality. You see your progress. You remind yourself of the important things you forgot.
Develop a central theme, main idea or thesis that clearly explains the purpose behind your autobiography. For example, your theme might be about how you overcame obstacles to become a stronger person, or it might explain why a particular passion -- such as mountain climbing or rescuing animals -- is so important to you. Back your theme with details and background information about your life experiences. For example, you might explain that your dad is in the military, so you've had to learn how to adapt quickly to new schools and unfamiliar environments. Or, you might discuss what it was like growing up in a poor, single-parent home, but how your family was always willing to take in injured or stray pets.