What Do You Think Of The Belief "I Am Not Enough"?

I question myself the paradox of this belief, lets say you think up with the derivative that "I am not knowledgable enough, or capable enough...to do what ever it is you want" or lets say you come up with an idea about how to make money, but then you think I won't make enough money from it, or it will take too much time and hardwork so I start seeking for another idea which is better. The bad side of this perfectionistic belief is the constant seeking for the better and how limiting it can be in taking action because you feel you still don't have enough or not ready. Then the paradox is if I belief "I am enough" won't this limit one from personal growth? What is your opinion about this?