Argument with Brother turns physical? What should I do to solve this?

We argue about the most simple things. Eg. The Playstation. I just want to discuss what we need to discuss without getting it too violent. There was this one argument:

My brother was complaining about me eating chips playing the playstation. He complained that this was getting the controller dirty, when I would only hold the chips by my fingertips and wipe my fingers on my jumper after each chip. I went on to discuss the other messes he makes such as walking out of the shower leaving the whole floor wet. etc and that it was no big deal.

The argument gets heated up, I try to stay calm and continue playing the game on the Playstation that I was previously playing. My brother uses other methods, such as turning off the internet via the modem and turning off the playstation. I tell him that this had nothing to do with the Playstation getting dirty and that he should just turn on the Modem back.

The only problem was the Modem is in his room. I walk to his room and he tells me to get out. I tell him I'm not leaving until the Modem is turned back on. After a while, I walk right past him and turn the Modem on and this is the time when he hits me and pushes me on the floor and I almost knock the bookshelf over.

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This is not the first time this has happened. I am three years younger, I'm 13 and he is 17 (I'll be 14 in a few more months, he just turned 16 recently). This happens every time we argue, my parents don't seem to do anything about it (they talk to him, tell him not to do it again etc. Happened at least 5 times now). He always does knowing I cannot take him on physically.

I don't think I did anything wrong, I walked right past him just to turn on the modem and he assaults me. At the end of the day, no matter what my parents do, he always wins because he gets what he wants out of me, pissed. I'm trying to stand up for myself and that doesn't work, he always thinks he can get what he wants. What can I do to stop this?
Thanks for spending your time to read this. :) I'm a guy btw.
When I say he thinks he can get what he wants, it's always the wrong ways he uses to get it. Sorry if I keep adding details in.
The Playstation is shared between us, after each wipe, the controller is clean enough so that it really isn't noticeable.
 
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