The starting point in personal development is you. Simple as it may sound, the only thing holding you back is you. Take a look at your beliefs; are they empowering you, or are they limiting you?
We develop our beliefs through experience in life and develop an inner talk that reenforces these beliefs. We can change our beliefs; one of the ways to use improve your internal dialogue with positive self talk. Take a look at the flood of positive affirmation quotes enticing you develop your positive beliefs used in in twitter for example.