Only if you want to drive on public roads. In order for your vehicle to be allowed to go on the public roads, it has to be properly registered, inspected, and you have to pass a test to be allowed to drive it on public roads. Many people who live in the country have vehicles that aren't any of these things, as long as they keep to privately owned trails, its legal, and many kids have been known to drive cars, as young as 9 for one of my cousins in the country.
In addition, vehicle insurance isn't to help pay for maintaining your vehicle, oil changes, new tires, etc. all have to be paid by you, the insurance is there to protect other people and property from the damage you could do driving a vehicle that weighs anywhere from several hundred pounds to several tons at speeds approaching close to 100mph. Note, I'm averaging here, vehicles means anything from scooters to big trucks(even boats), the law applies to all of these, even if the standards for weight class and requirements are different in licensing and inspection.
This is different from health insurance in that health insurance is supposed to pay for "regular maintenance" of your body. No licenses required to live, after all, and no tests need to be passed, nor inspections. Additionally, the insurance is for your benefit, supposedly, however, due to the nature of it, its far more expensive than basic liability only vehicle insurance which is the bare minimum required in most states, and only covers damage you do to others, not your own(in most cases).
Also, health care will ALWAYS be required by everyone sometime in their lives, if its a check up or hospitalization, its not something that you can avoid. While with vehicles, you can go decades or even never without filing a claim, its somewhat rare, but it happens, hence its easier for private vehicle insurance policies to keep the policies affordable.
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