Meditation is a practice. Everyones mind wanders even the greatest monks will find themselves wandering and have to pull their mind back. The trick is to keep trying, being aware. When you notice " hey I've been thinking about the dirt under my fridge for the last five minutes" just pull your mind back and re focus on your breath. It's completely normal.

Mindfulness is great like Perna mentioned, and you can do this while you do other things. Jon Kabot Zinn has some excellent videos on you tube.

Don't give up, there is no perfection in meditation, it's just practice.