You are not the first person who wants to write about his or her life. Many famous writers, artists, politicians, and businessmen create autobiographies to share their wisdom and experience with a wide audience. Find the autobiography that belongs to the author whose personality inspires you and read it in order to get a basic understanding of autobiographical writing.
For example, let's say you wrote, "From the age of ten, I knew I would become a concert pianist." What specific event triggered this determination? Can you describe that one event in a paragraph or two, using all the senses available to you—sight, sound, taste, touch, and smell? Using all five senses will help readers imagine the moment as if they were present with you. This vicarious act of reliving events arouses more emotion in readers than simple summary. and if you can master it, you are well on your way to writing an autobiography! Sensory description: The narrow plank felt warm and smooth beneath my bare feet. I ran its length in three strides, arms extended out from my sides for balance. At the end I took a weightless leap into eighteen inches of space. I caught a barely-there flash of metal just before I landed hard, all my weight on my front foot. Then pain like a red-hot poker jammed through my arch, and the gleaming tip of a three-inch nail as it emerged through the top of my foot. Summary: That day I jumped on a board with a nail in it and it went through my foot.
If the purpose of your autobiography is to pass on your story to your heirs, consider including memorabilia (e.g. pictures, heirlooms, medals, mementos, letters, etc.) and putting your story in a scrapbook format. Of course, you may not be able to copy the memorabilia that accompanies your autobiography, so you still have to think about what you intend to do with your original work and other items, such as medals or bulky heirlooms.
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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.