Your underlying beliefs about things are much stronger than any positive thinking you perform, and those beliefs will ultimately continue to manifest themselves despite your veneer of positive thoughts. To play alchemist with the world, which is your birthright, you must first change your beliefs.
You desire more money, a loving relationship, a great job, a wonderful home, a fancy car, etc., right? Invest your time in changing your beliefs and you'll find yourself attracting those very things. In accordance with quantum physics, once your beliefs are aligned with your desires, you cannot fail to attract these things. And that is exactly how the law of attraction can work for you.