Am I happy with my current job?
Am I happy in my current relationship?
Is this what I wanted in my life?
Am I doing engineering because I have to make parents wish come true?
I am okay about buying a house and paying EMI for the next 20 years?
Opportunity cost is a great tradeoff. What am I missing on account of what I am doing now?
Thinking in terms of opportunity cost keeps life in equilibrium.