Im not a fun mum. Im an angry, messed up mum of 3.. that needs help

Im in tears currently writing this..

I have just few friends. I have 3 kids. 11, 6 and a 9 month old. They're really good kids, polite, very well mannered. All towards other people. When it comes to me, were constantly fighting, i fight with my 11 year old the most and after i do feel really horrible because i dont want him to have hurt feelings, and i dont want him when his older to say ive had a shit childhood, me and my mum constantly fight. Im with my children 24/7 im a single mum. I do everything on my own. I barley have food in my cupboard. I manage to feed them. They have alot tho. They are spoilt. They get what they want but im starting to ease off on the spoiling and not giving into them. My 6 year old is a little bugger. He is really an emotional child, if he dont get what he wants he cries. If i ask him to do something he will straight up tell me no! Ive started to put him in his room for 5 minutes when i just cant handle him any more. Or i ignore him.

I dont get invited any where, my friends will go fishing, beach, 4x4, anything that could involve children as they have children also. I feel its because of my kids. My house is always a mess, ive got a 9 month old constantly on the boob or on my hip.

Im not a fun mum. Im an angry, messed up mum of 3 that struggles. I cant do it any more. How do i cope? How do i deal with my children? How do i stop arguing?

I know its wrong. But i cant any more. I feel like just giving up.