Yeah, you are overthinking, but your reaction's not that uncommon. Many guys hobby for the fact that it IS a superficial connection, they're not looking to get involved.
Personally, if an sp gives me a real name, I feel honoured that I have her trust. It makes the experience all that much more intense next time because we're suddenly [real name] and [real name] instead of just sp and john. But then again, I have an intimacy fetish.