There are 2 aspects here. There are those who say they enjoy their job, those who loath it and those who say it's just a job and there are much worse out there. All true and it is affected by so many factors as as been said.
Then there are those who say they do it because they love/loved flying.
These are the 2 aspects: it started out as a flying dream and became just a job as it has very little to do with the rock & roll of real flying dreamt up as a kid. And there are those who entered it as an OK type of job with a bit of glamour. Whichever it is it will turn out to be a 'lifestyle' and that will be impossible to predict unless you know from the start who you are going to work for before you pay out loads of dosh for a training course.
You can go to assessment agencies to be tested to see if you are suitable to be a pilot and coordinated enough to handle an a/c etc. etc. You can jump through all the psychological hoops and be deemed acceptable. But will you like it as a life style. All these tests will not give you an answer, nor will they alert you to the trap you are about to fall into.
Caveat emptor.