Some circumstances can be controlled, but others may occur without any opportunity to change them. Often people take credit when something goes right, but when things fail the circumstances are commonly blamed instead of the individual taking personal responsibility. No matter what circumstances you find yourself in how you react will reveal your true character as a person.
Be miserable. Or motivate yourself. Whatever has to be done, it's always your choice.
I say, when life gives you a lemon, wing it right back and add some lemons of your own