Feeling the weight of the world

Feeling like a failure and a fake. I know there are some of you who will have no idea what I mean, but many of you share it.
I have reached the end of my tether and feel as if I have fallen off. I would like to get back up and begin again, but I'm so exhausted. Physically wiped out, emotionally I am angry and stand of ish. Hubby wants a bit of intimacy - he's not at all demanding or pushy - but I just want to climb Ito bed and sleep, no touching. I feel like wherever I turn someone wants my attention, my time, my effort.
I've got three kids, all I've ever wanted to be was a mother. It was my dream, I always wanted children. Now I have them I am completely shattered. I love them but want to get far away from the bickering, screaming, he said she said, whiny stuff. I have taught them not to whine but they do. I have taught them to sort out their stuff together, when they choose to its great, lately they just get into a physical fight and scream, cry .........
I'm exhausted. I have a living situation where we can't get a babysitter as it offends my mil (who we live with) as she can do it. she stipulates the how's and when's to a point - a reasonable point. But if she's not avail ale we don't do anything - July last year was when we last went out.
Feeling stuck, can't move out, can't get a sitter, can't get a break. Blah. Just so over it.
Thanks for listening. It's such a whine but I guess I don't want advice just to know and hear from others who've been here.