If your writing is atrocious, or if you just need some help getting your thoughts in order, consider hiring a ghostwriter or a professional personal historian. Celebrities do it all the time. There is also a software that allows you to type your answers into a template on your computer, thus solving the problem of less-than-perfect handwriting. Many people also choose to type directly into an online template.
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.
People choose to write about their lives for a variety of reasons, including a desire to leave a memoir for their children and future generations, to create a record for themselves so they can be reminded of their youthful adventures when they're old and forgetful, and to offer something of value to the rest of the world. Writing a memoir is a very personal experience, but if you're willing to share your life story, it can be incredibly rewarding.