I'm also just going to give a few ideas for getting help.
1800respect offers resouces and help for people experiencing family/ domestic violence, and it's definitely worth looking at their resources and maybe contacting one of their counsellors.
If you want to tell someone in person about what's going on, they might be able to help. Just be aware that some people think that sibling abuse is the same thing as sibling rivalry. If the first person doesn't get it, you can always try another.
Find an adult you can trust (maybe your OT, a teacher, aunt/uncle or school counsellor or nurse).
It's best to start with something dramatic so that they understand that things are really serious, and make it clear that you want them to do something. Maybe something like "My twin tried to hurt me, and she might do it again. Can you help me?"
I don't know exactly how bad things are at the moment, but you might want to look up youth shelters in your area (I would do this for you, but for confidentiality and safety reasons it's important that you don't mention where you live here). Try googling "youth shelters [your area]"
Does your school have a school nurse you can see, or are there any doctors in your area you can see confidentially? They can help if you get hurt.
It can also be a good idea to learn first aid (this is a good idea in general, but especially if there's a chance you'll be hurt)
I'm not allowed to provide medical advice myself, but I've found you an online first aid library. Just be aware that the emergency number they list is the New Zealand emergency number, and in Australia you'd need to call 000.
First Aid Library
