There is no social contract, there are only people who seek to claim ownership over you simply for existing. Not leaving where you were born or ceasing to exist does not validate others having claim over you. The social contract is nothing more than people trying to justify taking your rights. No contract is unilateral, unsigned, and constantly changing and if there was such a document it would be thrown out by any court on earth. In the same way that the social contract between lord and serf is invalid so too is any perceived social contract today. The way the language of social contract is currently used it has become a blank check for government power and theft all handwaved away because 'you signed the social contract,' by existing. That is the logic of tyrants.