devlish angel, excuse the comments of some but most of us are talking generally and from our own experiences with insuring hi performance japanese imports.
Take into account that you virtually never hear of any 17 year old let alone a female buying a GTR for their first car. This is why most people you speak to will be skeptical.
Obviously if you can afford it then great, if you are paying for it buy the car, but if your parents are paying for it they are nuts, I know I wouldnt buy my daughter a car such as a GTR for someone with so little driving experience. Thats basic common sense. However if you must have one do yourself and every other motorist a favour and do some defensive driving courses before hitting the road in a GTR.
Best of luck