When im eating alone i actively hide from people walking past

At the previous school I went to I had designated my own room to eat in because I have some issues with noise. That was right next to a walkway where people regularly walk past and had a window with no curtains. Even though I had a chair and table I often sat on the floor instead to avoid the people walking past me. I don't know why but I just feel like I had to hide from them, especially if I was really hungry but also in general. I feel the same in other settings too, but that one was worst. I don't have any eating disorder and its a complete non-issue if I'm eating with a group of other people, in public like a restaurant or actually alone