Is it like this for everyone? I sometimes wonder how large the number of cases is where the parent does not feel like that at all but refrains from sharing it due to societal expectations and fear of being judged. It would introduce a bias regarding these stories.
No, it certainly isn't. But it is a social sin to admit otherwise. For me, it led to depression, therapy and medication. The first time in my life I'd experienced actual clinical depression. We do have a particularly challenging situation though. I'm always tired, ill, stressed, eat unhealthy, don't exercise enough. Being a parent is all consuming. It has been getting easier as they get a bit older, and I love my chi…
Why is it so torturous? For me, I'm a software engineer, and I became one because I'm obsessive. I like to think about a thing all day every day. The most I get now is maybe three 90 minute chunks a day, maybe a couple three hour chunks a week. If you're not like this you won't understand how it feels, but if you are, you'll know what I mean when I say learning to live without this kind of thing (I guess the term is need for cognition?) has made me into a completely different person.
It does get better though! We do daycare so when they're old enough I get a regular work schedule back. Definitely no nights or weekends though; those days are gone for the foreseeable future. But, like you, I'd do anything for them and I don't regret it. It's just hard to overstate how huge the change is--you legitimately are forced to become a different person (or, I guess, you can choose to not be a very good parent, idk)