It's all a myth & when we're excelling in one area, another is probably being neglected. For example, my startup is experiencing >+78% growth month over month. But you know what I've had to sacrifice for that to happen? Parts of my marriage. I can't give every part of me to everything, but he doesn't resent me for it; he supports me and steps in when I need him to. And vice versa.
Additionally, our cleaning lady comes 3x a week for 2 hours each day. She helps me keep up with the laundry, and she makes 1 meal for our family a week. Every 2-3 weeks on a weekend day, we hire a babysitter to come to the house for 5-6 hours so that we can literally complete tasks, like taking down Christmas decorations or running errands that have been piling up. if you can outsource, you must. And to echo CC, you have to say no to more things. Don't go to all the birthdays, don't go to all the happy hours, stay home on Galentines, don't frantically try to participate in every school activity or dress-up day... BREATHE! If it's not a RESOUNDING YES, it's a HARD NO.
And I am sure you are doing a better job than you're giving yourself credit for. Hang in there.