And most of us will spend 30-40 years of our lives, including all your prime years, spending that 40-45% to serve somelse's desires.
Even if you in enjoy your job, the reality is work is one of the biggest parts of our lives and wrapped up in our sense of self worth and identity.
My job (currently: senior software engineer) is a different beast, even if it touches on aspects of my career. I do it to pay the bills. I do it in a professional way but that's all about it.
Sure, our work time serves someone else's desires... in exchange for money that we use to build the home and life that we want. Hopefully spending our time and energy with the people and family we want. Work is a tool to empower everything else. Do that work - do it well. But let the "everything else" define you.
This is true for all living beings, all animals spend a large part of their day in collecting/scavenging/hunting food, prepaing shelter etc.
Speak for yourself.
I can completely fail at work, go home, and sleep like a baby. Conversely, I can have an amazingly good day, enjoy it and then completely forget about it the next day.
It's just a job.