When writing your personal history, I would suggest that you write it in first person. It will have the feel that you are telling your life stories to your children or grandchildren while they are sitting on your lap. It will help connect the reader to you in a very personal way. If fact, you can just grab a recorder and record some of your stories as you tell them to your children or grandchildren. Then listen to the recording to get a feel of how to write it like a captivating story (instead of dry facts). Give it a try!