ETA: my dad pays for my car insurance and car maintenance, and I pay for gas. However, the car is in his name and he legally owns it and could theoretically decide to not let me use it if he so chose. Being that the car is legally his, I don't really think I'm a horrible person to not pay the insurance on it.
And this train of thought is EXACTLY why most parents decide to charge their kids rent.
Nothing personal, but your parents aren't doing you any favors.