You will no doubt get a lot of responses as I am pretty sure Hankster and I are not the only ones who came from something like you describe.

If I had a do-over, I would do as Hankster said, find a way to get out and go to school, sooner than later.
Your self worth is critical. And right now, it is being squashed.

You will not regret getting out and learning to fend for yourself, so get going, talk to a school counselor about your options and be as open minded as you can be about places you can go to get an education. There are many wonderful places! Look into working at the school as well, there are often options to work for the school to help pay off your tuition. There are ways, is what I am saying. I only wish someone had been there to guide and encourage me to make better choices back then.

My mom told me an education would be wasted on me, I was only going to be lucky to find someone to marry me....! Yep! She said all that and more. I went on to be an educator and if I had listened to her, who knows what I would have ended up with. (good lord!)

In my experience, the relationship got better as I got older & had some distance. It gave her time to settle down and actually appreciate my accomplishments and gave me time to forgive her for pounding me mercilessly into the ground.
We both were better for accepting the normal ebb and flow of growing up.

I wish you so much good luck as you go forward! Keep us posted! We will always be happy to cheer you on!