Memoirists often struggle with figuring out what to include. A memoir, by definition, is not a story of your entire life. It is writing on a particular strand of your life - a recurrent theme or issue or approach - or focusing on one particular era. If you are including everything that is happening, it will not work.
However, you also need more than just the key stories. What might otherwise seem like mundane details - how you make your coffee, or did during that era, or how it has changed over time - could lend a lot of real human feeling and connection to the reader. And everything depicted in the memoir can carry the feeling of communication, the sense it was all included for a reason, even if - especially if - that reason is not explicit or overt.
How do we choose?
