Adversity introduces a man to himself.
It is in times of adversity that a man's true character is shown
~Martin Luther King, Jr.
There is no scarcity of opportunity to make a living at what you love; there’s only a scarcity of resolve to make it happen.
If you do not conquer self, you will be conquered by self.
I swear, by my life and my love of it, that I will never live for the sake of another man, nor ask another man to live for mine.
~ John Galt
Don't waste your time with "could've," "would've" or "should've." Focus on "can," "will," and "do."