I've often said jokingly to my students, "Writing a memoir is like taking your clothes off in public." True, but it doesn't go far enough. It's like taking your clothes off and reading your journal in public.
How can you make your memoir compelling? Find something unique about your narrative and focus the book around that instead of navel gazing about your first dog, your last lover, etc.
Unfortunately, many would-be memoirists stumble on the same writing hurdles: if only it wasn't so tough to begin, figure out a plot line, recreate conversations you had five months or five years ago, and keep it all interesting until arriving at "the end."