You dont know how lucky you are
OK your car insurance is high but do you have the overhead of a mortgage, house insurance, children, community charge, electricity, Gas, water rates, TV license, food, house maintenance, children etc etc etc.
Just thought I would advise you that you have that lot to come as well.....cheerful get aint I!
When I was 17 I had a 131 Abarth and at 18 had a Rover SD1 Vitesse 3.5 V8, which were dead fast (for their time) and cheaper to insure than an MG Metro! Have you thought about running a fast classic? For instance my HGT costs me over £900 pa and my V12 Jag costs just £248 (both fully comp) because the latter is a classic even though its only 12 years old. Just a thought.
Cheers
N
PS You do have my sympathy actually!