It's very normal to say "I can't meditate." I had a terrible attitude toward it when I did the mindfulness class. Dogmama had some very good suggestions. Almost everyone's mind wanders and doesn't shut down at first, which is fine. You have to train your mind, the same as training your body. And, I agree, guided meditation, with a teacher or tape is best. There is even a walking meditation in the Mindfulness class, as well as others you can download.