But, as potentially the first African American first lady, I was also the focus of another set of questions and speculations; conversations sometimes rooted in the fears and misperceptions of others. Was I too loud, or too angry, or too emasculating? Or was I too soft, too much of a mom, not enough of a career woman?

During the first campaign, one of my jobs as my husband's spouse was to travel around the country and really listen to women. There were voices that were new to me: the voices of military spouses, many of them women, and veterans.... I was overwhelmed by their challenges, and the notion that we as a country don't even know that these women exist, because we live in a country where one percent of the population protects the rights and freedoms of the other 99 percent of us. I thought that if I had the opportunity to serve as First Lady, I was going to use this platform to be their voice.

If my future were determined just by my performance on a standardized test, I wouldn't be here. I guarantee you that.

I am desperate for change - now - not in 8 years or 12 years, but right now.

Clearly this is a tough economic time, and a lot of families are hurting. So when we talk to parents, we talk about small changes for kids and things that don't cost extra money. Like adding water and eliminating sugary drinks and sodas. That's going to save money right there. Or adding a few more vegetables.

And in my own life, in my own small way, I've tried to give back to this country that has given me so much. That's why I left a job at a law firm for a career in public service, working to empower young people to volunteer in their communities. Because I believe that each of us - no matter what our age or background or walk of life - each of us has something to contribute to the life of this nation.

I think that mentoring is such a critical part of the role I can play in my position. I see how little bits of exposure and big bits of exposure really change my girls significantly, and I want that for more girls around the country and the world.