Sheryl Sandberg said this quote

She explained that many people, but especially women, feel fraudulent when they are praised for their accomplishments. Instead of feeling worthy of recognition, they feel undeserving and guilty, as if a mistake has been made. Despite being high achievers, even experts in their fields, women can't seem to shake the sense that it is only a matter of time until they are found out for who they really are- impostors with limited skills or abilities.