Is it normal to hate nosy neighbors?

Are my neighbors nosy? How do I find out? Whenever I get parcels for which the payment option is Cash on Delivery, my neighbors come out and ask the courier person where they are from, how they can order the same stuff, etc. Once they event went to the extent of calling the courier person inside their house after I had shut the door and asked for my order history and that even they would like to order stuff for themselves. I found out they did this, when I was going toward the tower elevator and saw and heard them talking about my orders to the courier person and was extremely shocked. This is clearly an invasion of my privacy for me, even if my mother does not agree, saying that they are only asking for themselves. Furthermore, they once wanted to "see" the dryer supplied by our tower office, whereas the same item is supplied to all the flats in our towers. I did not allow her to step inside my house for 2 valid reasons: Firstly, I do not want people snooping around my house. Secondly, if the manufacturer of the dryer has given us a defective piece, then he will not dispute with us, stating that we opened the package and that he will not replace it. My neighbor then asked me whether she can "measure" our door video phone. They are also going to get the exact same piece. Then why "measure" ours? I do not understand what the deal is with my neighbors. She gets angry and the next day on, we get letters in my name, but with our flat number canceled and theirs written on my letters till I wrote an online review. My neighbors never even invited us for their housewarming party, but they sure know where to go for "help" or "information" when they need them - to our door. What kind of neighbors are these? Are they dangerous? One night, I was about to sleep. There was a lot of noise outside our house. I switched on the door camera to see who is there at 11:00 p.m. - an unearthly hour. Our neighbor, who is dressed like a terrorist in white cloth, covering her face comes out and peeps into our video camera. It was ridiculous. We do not know what the deal with these people really is. Then yesterday, another neighbor asks us about why the head of my family is not staying here for very long, to which my father replied that he has to take care of his sick sister and is staying away for sometime. How did they come to know that the head of the family is not around? Do they keep spying on us all the time? We do not even know what our neighbors are like, what their lifestyle is, etc. We do not even bother to find out, because we are not nosy and we do not like nosy people. How did this happen then? Questions cloaked as concerns - one of the signs mentioned in articles that give signs of how to detect a nosy neighbor that is spying on us. How do we solve this problem? Do we approach the police? Why do I get the feeling that I am being watched over all the time? Furthermore, my father told me yesterday when I asked him who had come inquiring about why he is not around. My dad says it's not nice to ask that and that we have to be "sociable." I mean what are the limits to being sociable? Isn't this question from my other neighbor invasive? I do not understand how to tackle this and am at my wits ends. Trust me, I am. Not only are my neighbors nosy, but difficult to handle. They know I do not like their snooping on me, but they continue to ignore me and do it like I am crazy or something. Even my parents defend my neighbors saying we have to be sociable or we cannot live here and stuff like that. It just drives me nuts.