People who fail to achieve their goals usually get stopped by frustration. They allow frustration to keep them from taking the necessary actions that would support them in achieving their desire. You get through this roadblock by plowing through frustration, taking each setback as feedback you can learn from, and pushing ahead. I doubt you'll find many successful people who have not experienced this. All successful people learn that success is buried on the other side of frustration.
When your eyes are functioning well you don't see your eyes. If your eyes are imperfect you see spots in front of them. That means there are some lesions in the retina or wherever, and because your eyes aren't working properly, you feel them. In the same way, you don't hear your ears. If you have a ringing in your ears it means there's something wrong with your ears. Therefore, if you do feel yourself, there must be something wrong with you. Whatever you have, the sensation of I is like spots in front of your eyes - it means something's wrong with your functioning.