I’m self diagnosing, but I’m 99.99% sure that I suffer from anxiety. I’ve read article after article. YouTube videos about personal experience that I’ve related to. I’m pretty darn sure I have it.
However, I noticed while being at college that while walking past people, I feel that they are watching and judging me. I feel like I KNOW they’re watching me and judging me. I was bullied tremendously in school (I won’t go into it) which caused me to constantly be on edge when walking past people, especially alone. My mind goes: they’re looking at you, so they must be thinking how ugly you are. Even if it’s just a glance. They even turned around to talk about you with your friends, etc etc. 
Also, I’d like to note that I understand that the possibility of them actually even thinking about it is unlikely. But I still believe that they are. You could give me a brain scan that shows almost like a tv show of what they were thinking in that moment and I still wouldn’t believe you.