Some of the advice in this thread doesn't make much sense. If you drive like you're supposed to on the street, performance oriented cars are much easier and safer to drive than old beaters. More grip, better brakes and greater acceleration all give you the edge when you need to do some defensive driving. The only reason performance cars might be considered more dangerous is because they make it easier to go faster. But even the worst POS econobox will be able to go faster than most speed limits.
And about the dangerous oversteer on the WRX, that's just simply wrong. It probably isn't impossible, but you would have to go out of your way so much, it would never happen just driving home from school or something. Even on my RWD Trans Am, with 368 lbf·ft of torque and TCS off you have to purposefully give it more gas than you would need to in order to kick the tail out. Even in the rain it's not a problem. I highly doubt that a car heavier, less powerful and with an active AWD system would be easier to oversteer.
OP, it boils down to how responsible you are. No one knows you better than you. If you know you are going to speed everywhere and drive wreckless, get a Civic until you mature. But if you know you have the discipline to drive 'slowly' even though you have a relatively fast car, go ahead.