Have you ever felt like you're a thorn in someone's side?
Have you ever been somewhere - while knowing the entire time - that your presence is nothing but a nuisance?
I have only felt that way a couple of times, but I knew that it meant something. I went to stay with my grandfather for a couple of weeks once (I invited myself) and I felt so incredibly uncomfortable that I still haven't gone back. Nobody was trying to make me feel uncomfortable, they didn't have to. A person knows when they are not wanted.