Why am I writing my memoir?

I have to confess that I feel a bit awkward telling anyone that I'm working on my memoir. There's a little voice inside of my head that whispers "You're no one important. Why do you need to write a memoir?"
It's true that I am just an ordinary woman who has lived a relatively ordinary life, yet I think about the women who I come from who also lived relatively ordinary lives, and how fascinated I am by their stories.
When we emptied out my Grandma's house before everything was sold, I found this little diary that had belonged to my Aunt Edie, who was also just ordinary woman. I loved her dearly and I am fascinated by this little diary and the window it gives me into her life.
There is no one left alive who has known me for my entire life. There are stories from the past that no one knows except me, and there are tales that I have learned about my birth family. If I don't tell them, they will be lost forever, and so I write for my children, my grandchildren, and my great-grandchildren.
I have come to belive that anyone with even a glimmer of desire to write a memoir should pursue that goal. Do it for those who are yet to come! What a wonderful opportunity to teach and influence future generations!
Sixty years go when my Aunt was a young girl and wrote "Went to the show with Laura and Ed. Road to Rio, Bob H, Bing C, Dorothy L. Then we went to Menard's. I slept there" she never dreamed that someone who wasn't yet born would read those words. She could not have imagined that someone not yet born would treasure the opportunity to step back in time.
That is why I am writing my memoir.