A problem with autobiography is that detailing the past after many decades is too time consuming: The smallest event can become stories within stories within. And I’ve still got a life to live.
So, given that there’s no perfect beginning—certainly not beginning with childhood—“In The Beginning... Once upon a time...”—I’ll just recall something that suits my mood, whatever the day.
How it all hangs together will have to emerge (if at all) somewhere ahead.