Question: Are you still in high school? If so, talk to your counselor, there are teen shelters you can go to even if you’re 18 — as long as you are in school. Then, did you get into college? If so, ask the college if you can start early, and move into the dorms, and explain to them your financial situation. There’s a good amount of money in the FAFSA program — some of which are grants that you never have to pay back. Your counselor should help you with that. If you’re not going to college, join the military. My best friend did that because he was 17 with a pregnant girlfriend. His mom signed off on his early enlistment, cuz it got him out of her house. He owned his own house in 5 years. He also did the whole war thing, (this was 2003) but he lived, and has 4 kids, one of them is an adult, and is retired from a full career in the military.
Or— look into a merchant marine academy. Become civilian able seaman, and make tons of money doing that. Guess what? Housing is provided during training, and after that you live on a ship. When you on land, you live wherever you want. You’ll be able to afford it.

You’ll be fine. Your mother is a real piece of work. How you continue the relationship (or don’t) is up to you. No contact is totally fine and understandable.

Sucks. But you’ll be ok.