I highly recommend you to check out Bob Proctor and his content online.
The BIGGEST lesson I learned from Bob Proctor is his paradigm of the mind. Your mind is made up of your conscipous mind and your subsconscious mind. You have to consciously input positive images into your mind in order to achieve your dreams.
Action Plan: Here's an exercise related to this topic. Write down your dream day from beginning of the day to the end of the day. Start reading your “dream day” daily. You will start to believe in yourself and in your dreams and be well on your way to achieve your dreams soon.