"Sarah Lenti is a political strategist and policy advisor at SML Advisory Partners. She served as a director on the National Security Council under Condoleezza Rice and worked as a lead researcher for Mitt Romney's 2010 book, "No Apology: The Case for American Greatness." The views expressed in this commentary are her own. This piece is the first of a CNN Opinion series, "What it's like to be me," which explores the personal struggles Americans face at a time of profound social change."

"It was a year ago when a young woman stopped me in a neighborhood shop. She gazed at my stroller and started crying. She told me how lucky I was to be married with kids. My heart dropped. She didn't know me at all. I am a single mother by choice..."

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