I could keep shopping until I found a car I liked...or choose a bus....or train...or a taxi...or cycle...or choose none of the above and walk

Yes but I could also extend my example like you would, and state there was something you disliked about all of those options. See why your logic fails?

No one is going to force me to choose between a few vehicle options and then force that option on me because other people happen to like that option!

But if you think about it, you've ceded control over your transportation at least for anything outside of walking/biking distance. The bus/train company determines what the schedule of travel is, and taxi's choose what kind of vehicle you ride in. By not choosing a car, you've actually ceded control to the bus/taxi/train companies.

There clearly arent enough Ron Paul or Gary Johnson supporters right now to win,

Correction: There clearly aren't enough Ron Paul or Gary Johnson supporters who actually vote right no to win. All I hear is how good Johnson would be followed by a complain that their vote would be wasted, or people complaining that the government isn't limited enough by people who abstain from the system like you.

If you all voted, he'd be doing much better in the polls. Furthermore momemtum is a thing, even if you lost this election Libertarians would have more legitimacy next election. Republicans who don't vote third party "because their vote would be wasted" would consider it.

Essentially you're complaining about a system you aren't really trying to change. It's just whining at that point.

The Jews didn't vote for the NAZI party...they still had to be ruled by them though.

I wonder how many Jews didn't vote for Hindenburg (seriously, that was his name!) because their votes wouldn't matter?