All of us have at some point been responsible for standing in our own way at one time or another. Whether through limiting beliefs, or through bad habits and lack of discipline.
Limiting beliefs are incredibly destructive, largely because we often don't realize that they affect us. They sit quietly in our unconscious brain and gradually prevent us from realizing our full potential. And more than that, they make us unhappy. They give us a sense of pessimism, which can tint everything we do in unflattering tones. These beliefs act as your reference point. They inform every decision and opinion you make. They form your "internal operating system."
However, the good news is that the brain is plastic. It is always changing and even our thoughts are capable of changing the structure of our DNA. This incredible fact means that it is entirely possible to transform the way you think... reboot that operating system, so to speak, and thus live a happier, more fulfilling life.