OK, so first impressions are that this is an enormous block of text for the reader. If you haven't already you should probably paragraph more. It may be the character's personal style, but I think the block of text might put off some readers and agents. (It's something I particularly notice when I read fanfic - if the opening para is a long block of run-on conversation then I close the page and don't bother.)
It's very chatty, but in a sort of American over-sharing way and she clearly has a major chip on her shoulder. This and the way she refers to her children put me off her as a character, she doesn't feel very sympathetic. Even heroines need a downside to make them human, and every character arc has to start somewhere, but it's a careful balancing act. Go too far down the unlikeable route and the reader will get annoyed/won't care enough about the main character to read on.
I like the fact you give a possible reason for why she might be a difficult character - past bullying. That makes me give her a chance.
It's going to be tricky as you're obviously trying to convey quite a difficult, bolshy character. And the sentence structures and word choice do a great job of conveying a character who probably hasn't had many chances in life, maybe a bit of an outsider, not very well educated, bit of inverse snobbery. However it also makes it quite difficult for the reader to follow. They might read it and think, as I did, 'god, if it's like that the whole way through I won't be able to cope'. Add that to an unsympathetic character, and I would put the book down.
A solution might be an introductory paragraph, maybe in 3rd person setting the scene (though tricky to pull off), or even a retrospective comment from an older and wiser main character, that show the reader/agent that they're safe, it's not going to continue like this through the whole book!
Calling her husband a twat at the same time as admitting he's generally pretty decent doesn't help with her likability. Twat seems a harsh word, and whilst 'little fuckers' for the children could be interpreted as a fond joke (I refer to my DC as little buggers sometimes), the description of her husband somehow feels far more serious. It does however mean that your story 'hook', (the 'worst thing') is more effective because the reader wonders what could be so awful that it counteracts his decency. I do want to know what it is!
There's also a LOT of info to take in, in that first para. Some no doubt important for the story, some possibly not. Again it's probably quite in character but it does feel a little hard to wade through. I wonder if you could cut some of it - like the comment on the organic food - it might make for a more streamlined and compelling opening.
What would determine for me, whether I read on or not, would be how long this chatty style continues for, and where the action starts. If it goes on like this for more than 2 paras I think I'd give up. If it's just this and then it breaks into action or dialogue, in real time, then I'd give it a chance and carry on.
I should add the disclaimer that I don't think your style of book is the type I usually go for - I'm more of a classics/literary fan. Your chatty first person opening reminds me of some Young Adult books I've read, so some people are obviously keener on that style than I am.
How long have you been in the writing game? It's generally expected by reviewers/beta/critique partners that you fix the grammar and spelling before you ask for comment! It's really difficult to ignore the errors, and that impacts on how a reviewer perceives the whole text.
Best of luck, and sorry if this seems very harsh. I'm used to red pen critiques on my own material, and am expected to be harsh when I review other's work. If this is your first attempt then my critique is probably overkill, so sorry about that.
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