Is it normal for me to want my brother to die?

Hello,
Here's the short story:
My family is a family of 3. I have my mother and "my brother" and me. "My brother" is 23 this year and my mother is getting old. All my life I've been beaten up, literally, by my brother.
He's never helped me once with anything. He doesn't have a job, he just got his license THIS year (failed the driving and permit test a bunch of times), he doesn't do ANY house work and just sits there in his room playing games.
When he was little he was bullied and beaten up by kids his age. So now that he's older he's gotten fatter and more buffed up. He's a big guy.
The reason for this question is today. I was sitting on the computer playing a few games myself for a little bit. He wakes up at 1pm and starts gaming. Suddenly he screams at the top of his lungs my name. See here, the internet is slow because we can't afford high speed internet. My mom pays for it. A few minutes later he comes out and "fixes" the internet, making me lose mine. I sigh and he asked me why I sighed with an attitude. I told him he made me lose my internet and then he smacks me in the back of the head really hard and starts to walk away. My mom isn't home. So I retaliate and he pins me down the floor telling me to not start (because he knows he can overpower me). He then starts banging my head on floor a few times and punches me and now I have bruises everywhere. I told my mom, for the first time, and now tensions are high. He's always beaten me up when she isn't home over stupid reasons. I remember when I was 8 and my mother left us some leftovers. I was going to eat it and he comes out saying it's his. I start taking some and he knocks the shit out of me. He's 4 years older than me.
My mom is thinking about kicking him out, but she doesn't have the heart to and she needs him when I'm not home. What am I supposed to do? I was on the verge of killing him, a knife was right there, but I stopped myself and called her. I hate him. I've never done anything bad to him. I just want him out of my life and wish for his death.

He's my brother though, but I HATE him. I don't know what to do anymore, that was the last straw. I'm sorry if this is not an appropriate place to ask this but I've never told anyone about this and I am at a complete loss at what to do...