well that counsellor was full of crap!
Completely unprofessional. Is there another you could see? I promise they are not generally so stupid as that one!
Your brother , should eventually grow out of it, jealousy maybe.
I think things with your parents are out of hand, they are not right to say its your fault. >
If you are scared you can call the police you know. Or call child welfare.
How is talking to them when they are not angry?
It is definately best not to hurt yourself. I know you feel bad about yourself , but it is so depersonalising and can be addictive to some people.
You need to try promote self protection, even in the bad times. You are a good person and you dont need to be hurt, least of all by yourself. I know its hard, ive been there myself and it destroyed me for years, i cant get that time back now , please look after yourself.