<human>: My GF and I are perfect for each other and very much in love. We live together, and spend most of our free time together.

She has a car, but doesn't drive it, because she doesn't want to pay for insurance. I'm lucky, and my parents pay my car insurance, to help as I repay my debts.

We share my car, and it's really starting to bug me. I work a lot, and when I get off work, I hate spending my free time playing taxi, or being stranded at my house because my GF has my car.

I've recently begun to express these concerns to her, and she seems to get where I'm coming from, but continues to take my car. It's her only option in some circumstances; if I say "no car and no ride," She wouldn't be able to get to school/work.

Am I being a selfish, stingy, jerk-face for cutting her off? What is a good way to put my foot down without making it a gigantic issue?

Summarize the given text in a few sentences.
<bot>: Girlfriend an I both need my car. Is it an expected sacrifice in a relationship, or should I be selfish for comfort and convenience?