I know this will never be me. I do not have a "career" - I have a job so I can pay my bills and save for the future. While I mostly enjoy what I do, I hate the deadlines imposed by someone else without any thought to my workload or present project timelines. 2 kids is enough to keep me stressed with making sure everything is getting done. Seriously, it is like trying to herd butterflies. Can't imagine a whole house full of kids. I am an introvert and a worrier. This means I worry over if I have said too much/the wrong thing/wasn't clear enough and need time alone/quiet to recharge. Having routines and schedules certainly helps me a lot but I am BURNT by the time my youngest is tucked into bed. Having to stand in the hallway to watch him brush his teeth is pure and utter torture because I have simply hit my daily threshold of doing for others and my patience is gone.
The hours between getting home after picking up kids and putting them to bed are enough to make me nuts. The list of items that have to be reviewed/repacked/cleaned/signed while also cooking/cleaning/feeding/bathing/homeworking with kids is exhausting. Perhaps it is easier for an extrovert that enjoys busy time and people always being around.
While there are people that can "do it all" in some public light, many of them struggle but don't share that information. They only share the successful portions of their story. Every decision is about choices.
Don't know how old your kids are, but I definitely felt more like that when my kids were younger (they are 13 months apart). Now, at almost 14 & 15, there is still plenty to do, but if I drop the ball one night due to being tapped out from others things, they can successfully get themselves to bed. Do they brush their teeth? They say so, but unclear, and on certain nights....I prioritize. :-)