How do house wives do it?

Bianca • 25 | Wife | Philosopher • Mother • Lover • Discover 🌏🔭 Dave+Love+Children = Perfection 💋 ......................expecting................... ......................May 2018 .................. 🎉🎉🎉
I seriously, seriously hate being a house wife!! I take my hat off to the ladies who want nothing more than to be a devoted house wife. 
I can't stand it, 
I deferred from University for a while so we could start trying for another child, I occasionally do contract work and I foster animals before they go to their forever home.
So mostly I'm at home and I can't stand it,  I cook every single night and do the dishes everyday I'm the only one to clean the floors or the bathroom and the only one todo the washing. 
It's like I'm the only one to walk on the floor, the only one to use a plate or cup, only one that takes a shower/bath and uses a towel why can't anyone else in this household do something?
My cousin who lives in our granny flat down stairs is so sexist believes it's my place and my job, todo all these things my husband works 6 days a week so I understand he is exhausted on his day off, our daughters only 6 so she helps as much as she can. 
I don't get how house wives do it? How do they keep it up?? Keep the house running without having a nervous bloody breakdown. 
I walked into my kitchen this morning trashed, trashed from people's midnight snacking butter left out half melted bread left out crumbs everywhere drink spilt on the floor and I just can't take it anymore.
I literally felt like dropping to the floor and crying I never get a break never get a day off, I'm always cleaning, preparing meals doing something and I just can't keep it up, I feel more stressed at home than I did a Uni or working.
What can I do? 
Yes I've spoken to everyone, my husband says he'll try my cousin Meh fell on deaf ears. 
I'm at wits end.