Believe in your self.
Have you ever wondering that you set a goal and you couldn't accomplish it; check your self very well some thing is missing.
Poor mind set can never clamp the great mountain. Ask all the great people that had arrived to the top, they will explain to you that life is an algorithm (a step by step procedure)
If you fail to believe in your self, the steps will never be in orderliness, because the major role for you to play is to trust your self and tell the world that you can do it.
Always be positive, be a great thinker and you shall achieve your goal.
Thanks