Read this. It is by a guy who went to law school, graduated, and is now switching to something else. It contains this notable nugget:
It’s tempting to look back over part of one’s life and indulge in regret or self-praise when really, all the strands in the whole web of decisions that make up a life in progress are deeply and irreducibly entangled, and one can’t just chop one out without becoming a total counterfactual mess. (You may cite this as Gowder’s Holistic Argument for the Stupidity of Regret. Thank you.)
His blog looks interesting.