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.
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!
Make short sessions of meditation. If you practice regularly, you will see soon that you become calmer and it's easier for you to sit in a meditative pose for longer.
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