Try to concentrate on your breath—breathing in and breathing out (nothing special, don't change the way you breathe). You might even want to say those words to yourself at first: "Breathing in, breathing out." After a while, let the words go. When you find your mind wandering, notice the thoughts—don't judge them—and let them go. Do this by coming back to your breath.
That's meditation—simply being there with yourself for a few minutes every day, getting to know your own mind.
Read an excerpt from Elizabeth Gilbert's Eat, Pray, Love