Was your aim to succeed as a businessperson? To be the best parent you could be? To amass wealth? To become a musician? To find love or security? Whatever your goal, think of it as the unifying thread that drives your life, shows the failures and complications you overcame, and demonstrates how you ultimately achieved some form of success as the person you are today.
The autobiography is the longest and the fullest story about yourself. You can write it for your personal use in order to structure and perpetuate your memories. If you are sure that your life will be an interesting theme to read about, you may create an autobiography for the wider public. An autobiography covers the period from the day of your birth until today. If you think that your life journey will be a good example for others, include the information on how you have achieved your goals and success and how you got your autobiography published.