In need of serious help

[Owen Lol]

Before I explain what my problem is. I must admit. I am a High school student.

Now that that's out of the way. Here's my problem. I am forced to share a room. It's the most painful thing in my life today. I get so, so pissed off at my brother. Having to see him all the time. No time alone, nowhere to call my own. Only "ours". My biggest problem with him is that he never leaves the room. He is CONSTANTLY on the computer. Gaming mainly, but not all he does. When I try to watch movies, all I hear is the keyboard typing. Doesn't sound like much but when you spend $20+ dollars I prefer to watch it in peace. It may not sound terrible to some of you. But try it some time. Typing a fast pace. And the occasional talking on the mic and hysterical laughter, and the loud gunfire and explosions so loud I can hear it through the movie, and through his headphones. I rage my ass off . Also when I get from home, he doesn't look away from the screen, just stares with dead eyes at the screen. When I ask him to turn his computer off for the time I watch a movie. And that's to much for him. He ended up yelling at me and tell me "Shut the f*ck up you f*cking wuss!" I talk to my parents about it ALL the time. I mean more than three times day. I'm near tears in frustration when I think of how shitty this really is. The only real chance I have is to convince my parents to fix up our basement, it has real potential to be really nice with some hard work. And they say they'll talk about it and never get back to me. They try to avoid the subject as much as possible. I'm afraid to invite any friends over because he is ALWAYS here. And he has 0 social skills. I feel like I'm talking to a wall. No answer, no emotion, no cares but the computer. I can't do homework or anything like that in "our" room because it is impossibly hard to concentrate. Nobody I know shares a room.
I've tried so many things to try to fix our basement. My Dad was pretty adamant on fixing it for a short while. And in that short time, we got a lot done. We took the ugly bars on the ceiling down, moved everything from the basement to the garage (that was the longest process, took a few days of hard work) and we also installed new lights. If we could just put in the last effort, carpet/ hardwood the floor. It would be perfect. And he could game in the dark in peace. I'm tired of this life. I'm tired of him. I'm sick of being the one he does all of his complaining to. Which is a shit load when he's in a bad mood. Which is every day.
I chose this forum because it's one of the few ones that he isn't an active member on.
I've come up with so many valid points trying to convince my parents to just finish the basement. But they don't count for sh*t.
Ex. I could excel academically, socially, I wouldn't be in a terrible mood 60% of the time. I deserve to have it done. I brought home better grades than I ever have in my life. I was awarded for it. But I still feel that all of efforts are useless. I don't know what more I can do to prove that I deserve it. My parents constantly backfire things like "There are people in the world that have to share a room with their whole family!" And I just speak the truth, "Well we aren't those people! We can afford it! I deserve and but you just don't want to do it! That's the real problem and you have no idea what it's like to share a room. Having NO where that's just yours. Where nobody can tell you what you don't want to here."
I'm generally a happy person. But in all honesty, this may lead to a depressing.

If anyone has any valid points, ideas, suggestions, on how to solve, or even help the situation. Please share. I'm desperate now. And I never thought I would take it to a forum to hear what other people have to say.
He is currently on his comp, playing away at his games. Same as always.

From BD lover to BD lover. Please help.