The main thing that hinders creative thinking is our belief that we are simply not creative.
Look at it this way. If you tell yourself: "I am a creative person", then you have to have beliefs about yourself that support that identity. If you tell yourself, "I am just an ordinary human being", then you will have a different set of beliefs. Once you have a particular identity and set of beliefs about yourself, you will become interested in seeking out the skills needed to express your identity and beliefs. If you believe that you are "uncreative", then there is no need to learn how to become creative.