Following finance for the money - any regrets?

Aside from being involved in entrepreneurship/inheritance wealth, finance is generally considered the best career path for those who want to earn an impressive amount. Those who have entered the industry for money, how are you coping at the moment?

I am asking because I am in a bit of a career crossroad. I can do pretty much any technical/financial career I want (studying good STEM subject at target soon), but honestly, have no idea what I want to do. Currently I am looking at pursuing any career which allows me to retire the earliest (aiming for mid to late 30s), but I understand this is normally pretty frowned upon when making career decisions. 

I've also seen stories of people building up portfolios which they are able to live of off (in their late 30s), allowing them to retire whilst building generational income, meaning the lengthy/stressful working conditions are somewhat worth it as the payoff is huge. 

Any input appreciated 

TLDR: Entering finance for money, smart or dumb?