How can I avoid a brother who I have to live in the same house with?

Ok, I’m a 14 year old girl. My brother is 17, almost 18. He constantly bullies me, hits me etc. Now, I know I can be annoying sometimes, but thats when he provokes me. I have never hit him. But with him, if we are having a verbal argument, he becomes physical, and hits me really hard! Once he kicked me in the back, i fell on the ground. And this was in front of my mum! She didnt tell him off! He did it for no reason, he was trying to play fight, and I was telling him to fkn leave me alone! He’s such a loser! Only my dad tells him off for hitting me! But my dad is at work alot… he’s my mums ‘darling son!’ It drives me mad! I have to wait 4 years to move out!
So how am i supposed to avoid him? I have tried not talking to him, but when he asks a stupid question, like ‘what r u doing’, he damands an answer, even if it is a stupid question! Becuase my parents say to respect him, and he can boss me around because he’s older! WHAT DO I DO?! I swear, if he hits me again when he is 18, im gonna tell the police. I cant live with it anymore :( I dont have any privacy.
ps:Sorry about the length and if i sound whiney! x