Hi Dan,
Welcome to the forum.
You're right - a GSXR600 is way too much bike for a noobie. If you take some time to read the archives here, you'll see that we recommend that new riders:
1) Take the MSF course
2) Get the best GEAR you can affort
3) Start riding with an older, used bike. Look for a cheap, old 250 or 450. You will drop it while learning to ride. Why trash a brand new bike?
4) When you have THOUSANDS of miles and YEARS of experience, you may be ready for a new Gixxer 600.
Insurance is expensive because riding is dangerous, and because alot of stupid people go out, buy a brand new Gixxer (or R1 or CBR ...) and trash it (and themselves) almost immediately. If you want to save on insurance (and live past your 18th birthday), get a small, used (cheap) bike, take the MSF, and gain experience.
HTH!
BTW ... Happy Birthday!