I believe in the law of attraction, as I've done it several times in my life.
So if your usually in a good mood, or a bad mood, the law of attraction will give you exactly what you are focusing on the most. This is based on the frequency of vibrations that you send out to the universe. If you experience a lot of frustration, you'll tend to attract those situations and it will keep you focusing on the on frustration.
Think positively and think about what you want, focus on that, feel it and make it happen!