Everything is archived somewhere anyway, such is Internet today. You have two options here: either you behave yourself and don't post anything you might regret later, or you stop being such a pussy and caring what other people think.
People can already find out if you have written something by your writing style. Soon enough there will be tools where someone can put in your name and it shows them everything you've written on the internet, doesn't matter if as "Bernd", "Anonymous" or "Thomas Müller".
