One thing I have always advised those who are on the verge of choosing a career, or even those who are deep into their careers: Let there be no dissonance between who you are and what you do.
Your work is who you are. Do not say that you work just for money and that your real life starts after work. Or is it possible that you are a very affectionate and soft father to your kids and you work in a firm that slaughters kids of animals to sell packaged meat?
Let the deed reflect the doer. Let the doer reflect the Truth.