Mind and Body

I understand that in order to be centered I need to quiet my mind. How do I do this? During the day I have so much to do and my mind races out of control. It seems I am totally at its mercy and there is no way to stop it. The more I fight it, the crazier it gets.

What can I do?

Personally, i have a hard time staying my body, and when I do, i don't like it very well...