"How can one hope to attain a high degree of advancement in life, in character-building, or in all-around success, without complete control of personal habits, both physical and mental? The truly successful man has all his faculties under control. He has a strong grip on himself, and holds to his task of self-government under good fortune and bad, through prosperity and adversity. "
Good advice 110 years ago, good advice now.
Stop with the "can't" and just do it. Or don't. But, let it be your choice.