In regard to "needing" a laptop, perhaps you are unaware of this but it's becoming increasingly common for students at this age to be issued laptops by their schools. In fact, every 7th grader in the state of Maine is given a laptop (MacBooks I believe). Laptops are becoming a fact of life in school and this is only going to become more common. I teach in a private school and our entire middle school population has MacBooks - believe it or not these kids are incredibly responsible with them on the whole. Sure things get broken here and there but in my opinion the kids treat them better than many of the adults do. How are kids supposed to learn maturity and responsibility if you just keep telling them they're too young to do anything?
Okay, so kids "need" laptops in jr. high and high school now apparently. I graduated high school in May of 2009. I was perfectly fine not having a laptop through high school while taking AP classes and the like. And my desktop PC at home is from 2001. (1.2 GHz AMD w/ 512MB RAM). You don't need a "Pro" computer to get through high school.
Basically, I don't see why a MBP is "needed" at such a young age. Why not some cheaper PC. Relatively same specs for a few hundred dollars less. That way when one gets broken it's not as big a deal. And yes OP seems "above average" as you all say, but most kids I know wouldn't treat a computer right, especially if it was just given to them by the school.