Don't believe in the myth that 'one day everything will be different'. Do what you love, what you have postponed, and what you were born to do. Do it now.
Success, however you define it, is not like a restaurant where you pay after you have enjoyed your meal.
Instead it is like a cafeteria, where you can choose whatever you want, but you must pay for it before you eat it.
It's not that you don't know what to do, but rather that you don't have the discipline to make yourself do what you should do, whether you feel like it or not.
Self-discipline requires delayed gratification, the ability to put off satisfaction in the short term in order to enjoy greater rewards in the long term.