As another commenter said, roads are paid for with taxes, usually a special road tax collected from car-owning citizens, sometimes even from the specific area the road is in. I hope you pay your taxes.

What a ridiculous comparison, though. Like, really? If I were to use the same logic surely I could just walk into your own house and just live there free of charge. You cook my meals and clean up for me too, thanks. Oh wait, that's absurd.