I am in my late 20s and I have a very dull job which I chose to go in to because the career pays well long-term. It can be stressful but I generally get on fine as long as I plan well and keep on top of things. There are of course occasional curveballs but that's to be expected.
DP and I chose to live in London for career progression, we want to ensure that we have enough money to retire as early as possible and pay off the mortgage as early as possible. We are TTC although no one knows this as both of us are quite private.
Whenever we go up to visit family and old friends there is always at least one person who makes gleeful digs/reference to how much I must be suffering to be trapped in "the rat race", how happy they are to have children and how their kids mean the world to them and they would never put them above "some job", how I must be mental to do the commute that I do...
I dread going now, and there's something about the phrase that gets under my skin, even if I'm not particularly stressed about work. If I mention a stressful time period at work, e.g. year-end, then I get stupid comments about that being the price of being in the rat race and that's what I signed up for. But mostly I'm fine, I don't feel in any race and if I say as much then I'm just being "defensive" 
We've just come back from another weekend which was supposed to be chilled, fun, nice family BBQ, but instead I have come back feeling totally fed up, quite attacked and aggravated. I wish they would shut up and stop attacking me for prioritising different things in life.