It's probably just a much slighter one than the thick drawls you're surrounded by, so it sounds nonexistant to you. On the other hand, there's the old story that all non-Southerners think all Southerners sound like they're from Texas. Or maybe that's all of the South they know. Be scared if someone can recognize your Boston accent underneath it all. (Ever see the episode of NewsRadio about Lisa's Boston accent?)