Is this normal behaviour off people or do I attract unusual people?

It annoys me when people are too in your face and questioning you all the time. Im very quiet and private I like to socialise now and again but I always keep myself to myself. Theres a woman in her 30's I know from my course we hang out together and shes always asking questions and wanting to know everything. I was giving her a lift to somewhere (she doesnt drive) ll I said was that im getting a new car and she asked how im going to sell my current one. I said my aunt has offered to give me a grand and she said 'a grand for this you can get these for 600'. I said its had a lot done to it and that shes willing to pay it and she was like oh right then kept asking about how much Id paid to have the brakes done and that i could have had them done a lot cheaper. Her husband works with cars and she said 'I suppose its har when you dont know anyone into cars'. She then asked how i was going to afford the new car as i was currently looking for a job. I wouldnt dare to ask people all this lol. Then theres a man who is dating one of my friends on facebook he has bipolar I think and is always sending me messages about his new projects and that he wants me to sign a contract to work for him etc telling me im talented and all that (I think a lot is because of his symptoms). Ive said no because I dont know what I'l be doing but he doesnt give up saying that its what my friend really wants, he seems on a high most of the time. Ive started ignoring all the messages he is sending I just reply something like 'thats good, hope you are well'. The thing is on facebook he can see when ive viewed messages and when i dont reply straight away he'l send a message saying '1.30 am! Either you are at work or you dont sleep' referring to the time i viewed the message, its as though he's putting me under pressure to reply. Then theres 2 girls who go to my uni and make fun because I eat the same sandwiches everyday. They are not friends I see them sniggering after they have spoke to me. Ive started hiding my sandwiches and deliberately getting different to the ones i want lol. Its something that might happen at high school really except we are all in our twenties and studying healthcare courses. They also ask on a regular basis if I have a boyfriend to which the answer is always no because Ive never had one and am not too bothered. Why do people try to interfere (is interfere the right word?) so much? At the same time I dont really have proper friends. I just want normal friends but 'normal' people ignore me probably because Im not very social and dont fit in. Or is it me thats giving off wrong signals? Is all the above normal behaviour and Im taking it the wrong way?

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