I know exactly what you mean!!! Folks think they can automatically be your best friend and older sisters think they are your "spiritual mom" if you leave away from your family. I have hurt plenty of feelings by telling sisters in the congregation that 1) "I already have a mother" or 2) "You don't know me like that to be all up in my business". I've had several sisters tell me that they wanted to be my best friend and be "my sister". Haha...you don't tell people that...you get to know a person and see what happens. But in my opinion, its people being nosy and a lack of social skills.
I've noticed that when you meet folks in the hall for the first time 1) they want to know if you are a pioneer (even though they are not and never have been); 2) your age (which is a very RUDE question to ask but witnesses do it all in the time in their first conversation with you. If you converse with a person for about 10 minutes you can figure out a general ball park); 3) are you married, divorced, dating, single or recently dumped. Then if you answer any of the above...they immediately dive into very personal questions...all in an attempt to "know me and be my friend" and I would tell them that they call it what they want, I call it being nosy.
Even at work, I've never worn the JW tag on my forehead like many witnesses do. If folks that work at the same company see me at an assembly or somehow find out that I'm a witness they want to come to my office and just hang out, like being witnesses makes us automatic friends. If they run into me in the break room, they want to chat it up about the theo meeting, assembly, etc and invite me over for dinner, etc. Now before they knew I was a witness, they wouldn't speak to me because we are at very different levels in the corporate ladder...but all of a sudden they are my best friend because they found out we're both witnesses. It was very irritating. But I think word has gotten out that I don't attend the meetings anymore because now the witnesses at work avoid me like the plague. No complaints about that.