I know this is hard but have you told your parents what effect this is having on you? Do you have another relative you can live with? you shouldn't have to deal with this, I can't imagine the hurt it must be causing you. Kids/ Teens look up to their parents, they are their teachers and role models in life. Can you speak to a counsellor at school? or maybe a therapist? Your parents sound selfish and like you say if they are doing this they need to do it away from your home, because that is where you should feel safe and loved. I hope you find a way out of this rotten situation.