Judging by how you talk you are probably from north Jersey, New York City, Connecticut or Rhode Island. Chances are, if you are from New York City (and not those other places) people would probably be able to tell if they actually heard you speak.
It's accurate, though. People say I don't have an accent and are usually surprised to hear where I'm from. You can hear it in certain words, though (I pronounce the "th" in south like a "f", and so forth)