Honestly? This place is far down the list of places where anyone looks for deviants these days. Content here is and has historically been kept strictly legal. There's a multitude of other places out there that have since made GC look quite tame and boring in comparison. Is it possible someone you know IRL might stumble upon this place and recognize your personal stories? Anything is possible. Is it likely? Definitely very unlikely.

Of course, if you were including lots of specific details, that would be a higher risk. Hopefully you knew not to do that if that was a concern for you. Otherwise, I'd suggest simply abandoning the other nic and letting it drift away into the archives as more than enough, to greatly reduce the chances of an acquaintance who stops in to lurk discovering your posts. This place won't be here forever. Archives of it surely will be... somewhere, but probably not easily accessible by the public.

If it's still a huge concern, it looks like Caretaker is willing to discuss it with you. I can tell you though, don't waste his or her time unless you truly feel you are at great risk. It is an extremely rare privilege granted to anyone, and extremely tedious for the one tasked to do it. Posters here are expected to look out for their own safety when they originally agree to register. Hope it all works out for you.