Have you considered actually accepting what you wrote, "water is thicker than blood"?
Maybe it's time to move past your grief for your family. Start your new life now. Except, you don't have to change you. Change the people you surround yourself with (or try to). If your family isn't interested in you, supportive of you or giving any value to your life, find people that will

I know that's easier said than done, but the pain in your posts is heart wrenching. You deserve people who love you and want to make your life better.