You emit a vibrational signal and the universe responds by bringing to you a reality that matches your signal. Change your signal and your reality will adjust over time to match your new signal.
Your vibration in the culmination of all of your fears, desires, experiences, pre-birth intentions and beliefs. The vibration you have been offering is largely due to your overall set of beliefs. You have some very empowering beliefs, which have led to the creation of the wonderful life you now enjoy. But you also have some limiting beliefs and they limit you from experiencing much more out of life.