This is why Democracies and tyrannies will exist. The fallacy of choice. (Oh hai, tragedy of the commons, tyranny of the majority, all that jazz...yeah, I mean, hell who wouldn't want that?)
As to your assertion about you getting fenced in, no one would sign a contract that didn't stipulate you had the freedom of travel and the easement to use the roads in front of your property. More than all likely, the property would include those roads, therefore you would be buying the roads also. Not only that, private roads all ready exist. They are called the parking lots in front of companies. It is advantageous for the free travel of individuals to businesses (Excepting of course, highways, bridges, thoroughfares, and other major connectors due to price and resource consumption, therefore businesses would arise to meet the needs of the consumer. Roadways would be far better managed, and far cheaper in a total free-market system.).
Please, read Walter Blocks Privatization of Roads it answers every single socialist/Statist rebuttal.
Also, do you believe that our rights are derived from private property (AKA Natural Law), and any violation of Natural Law, is a violation of our Natural Rights? As I said before, once you violate and legitimize that violation to our rights, there is nothing to stop even more encroachment to our rights. This is why any violation of Natural Law is an arbitrary violation, and also why States always increase in power and never decrease. There is no legitimate violation of our rights, period.