Trainee, sometimes our 'dream job' can suck the joy out of our career. Some find different hobbies, others buy/build and airplane and regain our happiness in general aviation.
If I knew then what I knew now, I'd have never stayed in aviation. That said, I have found a niche where I (more or less) fit in.
If you are wearing blinders, so all you can see is 'the airlines' in your future, then you'll likely have serious doubts in the future.
CE