Read The Joy of Living: Unlocking the Secret and Science of Happiness by Yongey Mingyur Rinpoche. It will answer all your questions about meditation, how and why it works, what method is the best for you, etc. You can buy it here.
You can meditate while driving your car or while walking or doing anything else. All you need is keeping your back straight and being concentrated on some object or objects like people around you, sounds you hear, your own breath, etc. It really works and no one will even understand that you are meditating.
This method works for everyone, even if you are always busy, it won't take any extra minute from you, because you take a shower every day anyway. So just concentrate on the feel of the water upon your skin and imagine how it washes away all your negative thoughts and fears. That easy, but works amazingly!
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