I'm a nursing student but I work as a CNA on the weekends and I get the "you must be my doctor" thing all the time. I guess I look the part when I walk in with my clipboard, white labocat and stethescope flopped around my neck. It's something we men are going to deal with for the foreseeable future, especially with the older generation of baby boomers aging and needing more care. Most of the patients have been very encouraging when I set them straight and I rarely get a female patient who won't accept care from me as a "male" nurse. I tend to use the title RN which seems a little more gender neutral - at least in my mind.