True, writing is a helpful way to express oneself and a medium for a quiet introspection. For me, there is no better way to recount how my day has been than to write it. I have always found it fascinating to read through my previous scribbles and rediscover the kind of person I was at that time and the person I’ve become. And that for me, is good enough as a story. Use chapter divisions to give the book structure. Chapters are useful because they allow you to move on from discussing certain life periods or events. There's a reason we have the expression that we've "closed a chapter" or "opened a new chapter" in life, and it's even more applicable when discussing an autobiography. Chapter breaks allow you to skip forward 10 years, go back in time, or start describing a new theme without jarring the reader too much.
Weave in themes. Use the major themes of your life as a way to tie stories together, connecting your past and your present. Aside from the central conflict, what themes have followed you throughout your life? A fondness for certain holidays, your fascination with a certain place that you visited over and over, a certain type of guy you've always fallen for, a rich spiritual life you fall back on again and again. Bring up the themes every so often to help form a cohesive picture of your life.
The idea is not to delude yourself that bad things are actually good. It is, instead, to find meaning in the progression from one event to the next. It is to recognize that everything constantly changes. In your life, you will move from triumph to heartbreak to boredom and back again, sometimes in the space of a single day. What are you to make of so many emotions, so many events?
Create an outline or a graphic organizer of the major topics and ideas you want to cover. For example, you might make a time-order chart -- a chart with event blocks to organize events chronologically. Or, you might draw a cluster web -- a diagram with connected circles -- to divide your autobiography into sections, such as one for relevant background information, one for life-changing events, one for special memories and one for goals and dreams. Focus on reasons why specific events, situations and circumstances were important to you and how they made you feel.