Chaos gave some good advise there. As far as accident avoidance courses, look into SKID school. I don't know if they are in your area but your could google them and find out. That will reduce your premiums a little and it's a great course to have under your belt. I don't know as much about Skip Barber but I've heard good things about it too. But the thing is, no matter how skillful of a driver you become, you also need good judgment to go with it. When you drive, there will always be things out of your control. I'm only in high school myself and I probably wouldn't trust myself with such a fast car either. It only takes one bad decision to change your life or someone else's life. Odds are that you won't get in a serious crash with a 370z but there is still a greater chance of something bad happening than in a rav4. And just imagine how crappy you'd feel if you crashed the car you spent 5 years of your life working for.
Still, it doesn't mean you have to stick with the rav4. There are a lot of fun cars out there that don't have as much power. As you can probably tell from my name, I have a 77 280Z. The S30s and S130s are fun cars that aren't so dangerously fast. As far as new cars, a civic si, cobalt ss, eclipse, tiburon, mini cooper, lancer, or anything like that would be good also. But ultimately, it's entirely up to you (and probably your parents) what you drive. Only you know what you'll be able to handle and afford. You just want to make sure you don't end up on the evening news wrapped around a tree.