Whats the point, to my pathetic life?

I'm 28yrs old living in leeds in a nice 4 bedroom house with my partner, we're engaged. I'm a full-time nurse, but a **** one, my collegues hate me. I have 2 children and one on the way. my little girl is 3 at xmas and my little boy is 13mths. My parents died when i was 16, both from cancer. my brother doesn't talk to me, always busy, doing his phd and my mums family live in ireland ( lived there for 2yrs when my parents died) and my dad side live in plymouth. i never see them or contact them. i have no friends in leeds, probably cus i don't like going out socialising, cus people alwyas gossip bout how miserable i am. i'm always at home no ever comes to see me, expect me to go out. i've tried mother and baby groups they are too clicky. I also suffer from anaemia, never have energy. I've even tried counselling, didn't work, now i'm getting involved in touchstones, but i have to wait a wjhile for my first appointment. i feel like giving up. my fiance, has had enough of me always making excuses not to go out. his poarents look after the kids while i'm working, they stay there 4-5nights a week. my little girl hates coming home. i'm useless. i can't cook, my partner does that, i do all the cleaning, i can't drive, can't swim so feel embared when going abroad. i feel like giving up, the kids to live at his mum and dads, sell the house, and jus go..... i don't wanna get married cus no one will come.