Jizzle you don't say how old you are, but regardless of this there are laws to protect you. I presume that you may not be able to leave the home for some reason or other, you need not say.
I think that you need to discuss this again with your parents and emphasise that this is not acceptable behaviour for you or any of your family. If you feel you are not getting anywhere with your parents then perhaps consider confiding in a close relative or family friend. If you are a minor then there may be an older relative that you can confide in and will listen and help you act. Failing this, you will need to contact a professional, whether it be your doctor, someone in social services or the police.
If you are online, there is link below which defines the things that constitute abuse and from your post you may be a victim of varying kinds. Either way, the law is there to protect you and you will not be alone. You should not be victim to a family secret, you deserve protection.
At the bottom of this web page there is a link to useful links and contacts which may be of great use to you now or in the future. Best of luck.
http://www.bbc.co.uk/radio1/onelife/personal/f amilies/a.shtml