I've worked many jobs in many fields from floor sweeper, to Electronics Technician, clothing manufacturing to the Aerospace industy.
And I was happy in jobs that other people absolutely hated.
Mostly because I practice thanking God for whatever job I have and always try to excell no matter what the job is.
I also refuse to feel sorry for myself in adverse circumstances and don't allow myself to be occupied with negative thoughts for long.
As a man thinks in his heart, so is he.
In many jobs you are punished for that.