Want to quit

If mothering were a job I'd've quit ages back. I don't want this to become a crib portal but that last few months have been so bad that I feel like I'm perpetually living on the verge of a nervous breakdown. What's worse is that H and N are turning out to be so wilful and spoilt that I feel I'm just not upto the job of 'mothering'. Really envy people who have brought up well-behaved kids. I so want them to be decent children but they just don't LISTEN to me at all. They throw toys around and push each other. They're still not potty trained, they don't sleep at night and lately have been giving me hell during meal times. It's crazy. Can't believe this is the best I can do.