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.
Stick to informal language, unless it’s absolutely necessary to use formal terms. Instead of “utilize” you can just put “use”. Focus on simple language, with one or two syllable words. The only time you should be using higher level language is if you are using scientific terms or describing a technical process. Even then, you should be writing for the average reader.
What to write: Choose one or more of the sentences below and write a page or two that begins with that particular sentence. Don’t worry about bringing up material that you are afraid might be too painful to explore, says Temes. “Please don’t bother with grammar or spelling or punctuation issues. “Just write for yourself and for your clarity of mind.”
These two sets illustrate how you should show the entire action and then show the entire reaction. Don't mix the two together in one paragraph. Write your entire book in this way — action and reaction, one complete set after another. If one part of the set is missing, readers will sense an awkwardness. If you're writing an autobiography, or anything else, action/reaction sequences will make your writing lively and natural. As you expand your ideas, write in action/reaction pairs.
Train yourself to use concrete details rather than abstract concepts. Take another leisurely look at what you've written. Highlight abstract phrases such as "I was afraid," or "we had a pleasant time." Replace these abstract words or phrases with something concrete, such as "my hands shook and my mouth felt stuffed with cotton" or "We drank Chardonnay on the Chatterley's sailboat, and as the sun set Rachel and I walked hand in hand along the boardwalk." Was it "a hot day," or was "the asphalt so hot that your flip flops stuck to the tar"? You might go back to the professional autobiographies you're reading and type out a few passages from the books for practice. If you're watching for it, doing so will focus your attention on the concrete. Most ordinary readers won't think about whether or not you've used abstract or concrete terms. They will know whether the writing is boring or interesting. Writing an autobiography with concrete specificity will only improve it.

Start by writing the story of your life for yourself first. After you edit and polish it, share it with a few trusted people. Then, after you edit and polish it again, share your life story with a wider swath of people. This will help ensure your memoirs are your best possible work, and that your writing is something you’ll be proud of at the end of your life.
Im scared to do it. I just have things I need to get out, I need to release things that have been hurting me for a very long time. I don’t really feel happy with. I just want to let things out in a private way. I don’t think I want anyone to see these things but I am not sure how to get started(for me) I am sure there are other ppl who prob want the privacy. I am not a writer. I just am looking to get things out that are and have been hurting for a very long time. In a private matter. I do however have a jumble of info flowing constantly. Pls I just would like direction. Thank you for your time.
What's your story? Anyone who has lived a full life has something fascinating to share with the world. The trick to writing an autobiography is to treat it like any good story: it should have a protagonist (you), a central conflict, and a cast of fascinating characters to keep people engaged. You may want to think about a certain theme or idea that has been present in your daily life to revolve your story around. Read on to learn how to craft the story of your life and polish your writing to make it sing.