How do you deal with abusive older brothers?

I am a seventeen year old girl and recently my brother hit me with a cardboard brochure which has caused bruising on my eyeball aswell as swelling and cuts on my eyelid. My parents were furious at him but won’t kick him out of home because i no longer feel safe to live with him. He is 21 years old so is capable of living away from home and this isnt the first time he has been abusive towards me. The worst thing about it was that i didnt even do anything wrong i just told him really nicely to calm down because he was being a real jerk and he hit me. What should i do? I am on anti-depressants because the whole situation has really affected me.