((((Final Nirvana))))
I'm an old hag of 40, but I'll never forget how miserable I was when I was 14 - NEVER!!!! It truly was one of my worst years. Everything did seem petty and pointless and I was depressed and miserable. Now whenever I meet someone your age I ask them whether they like school, and I'm always surprised if they say they do. Junior high/middle school is something that you just have to get through - Just survive it. Adults don't realize how traumatic it can be. Now when I look back on it, I can still recall how awful it was, but also - and this is important - that it's over 
!!! That's what I didn't realize at the time; I felt like I was going to be stuck in that bad place for the rest of my life. Nobody could have convinced me otherwise. It's only now, in my twilight years(!), when I looked back at my long and eventful life with 20/20 hindsight that I realize that yes, it was almost unbearable, but that it was also just one phase of my life. I don't know if this will be helpful, but I would advise you to tell yourself "this is stupid, but it's just temporary! I'm going to move on to bigger and better things and leave this all behind. Far far behind..." I'm not trying to minimize your pain in any way; just wish someone had told me, when I was that age, "Hey - there is a big world outside of this stupid school, and you have all kinds of exciting and fulfilling things waiting for you in your future, so just get through this."
I don't know if that will be at all helpful, but I was so moved by your post, because I'll never forget how horrible that time was, and I wish a senior citizen(!) like me had assured me that it would definitely get better. Just get through it...