Fanora,
I am so sorry. It doesn't matter if someone what other people have been through, and no one should ever compare. Someone here on PC once told me, "If your finger gets cut off and someone's hand gets cut off, the fact that they have a worse injury doesn't make yours any less painful".
Having to live with anyone abusive, especially when no one will believe you or let you get help is unimaginable. Except you don't have to imagine it.
I have had to get help despite my family not being supportive. My grandparents took me in and are helping me now. It's painful that they won't help me, but it has been really helpful in my recovery.
Is there any way you can get out? Are there any domestic violence shelters or something near you that might be able to help you? I am so sorry for everything you have had to go through.