I really feel for your situation. Unfortunately, nobody here would condone that path, as it is expressly against the law (as you have acknowledged yourself) and it goes against VJ TOS to give any advice that would not be a legal option. Also, for what it's worth, there's a lot that could go wrong with that plan that would just land you back at home, and even potentially with a ban from entering the US at all, or at the very least with your current K1 now under more intense scrutiny.
Rather than focusing on marriage as a way out of your situation, I would really encourage you to look into whatever community resources are available to you in your area of the world. Domestic violence shelters, etc, to get you away from your parents and on your feet independently, first. There is no quick way out of your situation that is legal and involves immigration to the United States.
If you fill out your timeline, or at least tell us what embassy, others may be able to tell you how much longer you have to wait in the K1 process, or even point you toward resources available in your country.
I'm very sorry for everything you're going through. It sounds extremely hard.