There are many different philosophies on beliefs and how to change them, but the bottom line is that if you are carrying a negative, limiting belief about anything, it is affecting your life. The first step is to recognize the shortcoming and the second is to take action to change that belief into an interesting point of view that will be more beneficial to your life and happiness.
Change is constant and continuous in life, we are all changing physically and mentally each and every day. You have the ability to move these changes in any direction that you choose. It all depends on which interesting points of view you decide to entertain. Since it is all a choice, decide to hold onto points of view that are going to make you happy!