I have to admit the ITR would not be a car I could recommend as a first car. At your age, you are still learning to drive and chances are extremely high you will have a fender bender or 2...the insurance on an R will be very very high for someone that is <21 and you will likely be dropped if you have an accident or 2.

My advice, is to get an older car, say 94-95 Integra GSR (assuming you do want some performance) that you can learn on, and then even spend $ to mod after you get some milage under your belt.