We will consider this four elements in order to write your autobiography.
1: Childhood.
Here you convey the early influences, including the environment you grew up in and the significant people and events.
2: Early adulthood.
Here you describe the aspirations and challenges you faced early on, how you took advantage of opportunities, setbacks, etc.
3: Peak
Here you describe the major turning point in your life. It may be how you made your best achievement.
4: Today’s situation.
It's a good idea to decide on two things before you start...
1. Your greatest achievement in life.
2. The ultimate meaning of your life.
Knowing these, you can then work backwards, identifying the significant events that led up to these two.