I mean one can only be stressed when he/she isn't been appreciated or doesn't like what he's doing and if you don't like your work then it's a wrong career. (my opinion).
It is your opinion. But look at it like this; a medical doctor can be very stressed out after standing for a straight ten-hour operation, while still feeling fulfilled about having saved a life. Also that same medical doctor can be stressed about losing a patient during his/her night shift (even though it may not have been their fault).
I don't believe there's a happily ever after. There'd be challenges no matter how much you love what you do. It's WORK, it's not meant to be easy, but it should be something that you always want to go back to and be better at.
Also, a stressful job does not mean a wrong career
although I'm against the way the current ones are been operated. Schools just program you to be a poppet of the government. Since you're writing about careers put some emphasis on skills because it give you an advantage over others with just college degree.
Standardized testing discourages diversity, and tries to lump student with completely different strengths into a particular direction.
I also didn't put emphasis on college degrees. I was generally writing on any form of education one ventures into.
It's also important to pick a skill you're passionate about. Entrepreneurship is good, so are college degrees, so are talents/gifts. Just do what brings you fulfillment.