First, write a brief time line of the major events in your life. Read it over, and see whether you've written a happy story or a sad one.
When I did this my story was sad.
If you want to go more in depth into this exercise you can do parts 2 and 3, or if you prefer, skip right to part 4.
2. Rewrite it selecting events and recounting them in ways that show you as a helpless victim (this is just to get it out of your system).
3. Then, try still another personal history, this one is designed to make your reader laugh.
4. Finally, tell your story as an adventure saga in which you are the resourceful hero, a modern Odysseus overcoming every obstacle on his perilous voyage, a Joan of arc beating almost infinite odds to lead the French to victory.
When I did this I had just seen the movie Wonderwoman. So that probably helped!
But I found it so incredible to look back and see all the hardships that I had overcome, how I continued to achieve so many awesome things, follow my dreams, and thrive!