I wasn't aware of the other thread, but let me comment on this one. WARNING: this is going to sound mean, but I'm trying to help you where others refuse to do so because they're nice.
You're 13. I would be absolutely shocked if you possessed a problem that could not be solved by someone higher up in the power structure.
Now here's something I wish someone had taught me at that age: if you feel like there isn't a single adult in the entire world who gives a damn about your problems, you're right. Adults don't give a flying crap about teenager's social issues. But what to do?
This isn't just the case for teenagers, it seems to just be a fact of life. The sad fact is, you need to make them care. They don't care if you're upset. They don't care how you feel. Telling them that will accomplish nothing.
Because see, when it comes to your emotional well-being, nobody with the power to do something about has a dog in that race. They do not benefit for the great deal of effort it would take to live up to their promises of a safe learning environment.
No, you need to give them a reason to care. A reason that affects them. You seem intelligent, are you getting good grades? Stop that. Tank your grades. 13 is what...8th or 9th grade? Unless you're planning to go to Harvard it's really not going to matter if your A's turn into D's all of a sudden. But the adults will start asking questions about why your grades have dropped (especially the tests, do poorly on the tests), and that's when you can blame your academic struggles on the bullying.
I say the tests especially because unless it's changed since I was a kid a school's funding depends on getting high test scores. The average standardized test score goes down, the school loses some funding, and *bam* there's their dog in the fight. There's their reason to care.
But I'm really sorry this is all happening to you.