Don't do it Zwan, just look at all the people here who don't even really know you who don't want you to do such a thing. Life is hard, there's no denying that. We struggle through, and each day you make it is just another day to appreciate. There has to be something you'd miss in life, even the smallest things. When I had thoughts like you back in high school I thought no one would miss me if I did, then I remember a friend of mine who's father committed suicide a few years earlier. Her brother found him when he went to visit, hung in his room. It was a horrible time for her and her family, and though I didn't know him I felt so bad for her to have to go through such a pain. You might not think it but there are people who will miss you. How do you think your brother will feel if you do this after you saved him? He needs you, maybe you two could find something to do together, a common hobby or something.
Talking about this now and looking back, I would have never met the people I have, I wouldn't have the things I have now that make me happy, and I might be in debt with a huge credit card bill to pay off but I wouldn't give any of it up. I started to list out the little things I'd miss if I did commit suicide, the stupidest little things, like my favorite TV programs, getting my comic books and reading the fantasy stories I would escape into each week/month, or even a movie that I was looking forward to, or new video game. Maybe not have spent so much...but I'm glad I didn't. I would have never been alive to see The Dark Knight (best movie ever) or play Arkham Asylum (best video game ever).
Even though like you I didn't think anyone cared about me it would have put my family through hell. Just think about it, there has got to be something you'd miss, some little thing that you do look forward to that if you took your own life you would no longer have, cause that's it, once you're gone, you're gone. No do overs, no take backs, no mulligans. It's the small things in life that we don't even realize that give us joy.
Like I said when I started this lengthy post, there are people right here who don't want to see you do it, complete strangers who care about you. You might think suicide will solve your problems but it won't help the fallout from you taking your own life. Eventually it will get better, at some point in your life, it could be years from now but when it does do you really want to have missed out on it?