Is it normal my teacher stares at me
So I'm casually walking at school and this science teacher states at me ALL THE TIME. He's about 22-23 and he just stares, no expression on his face. If I look at him he stares for about 2 seconds and looks away fast but he makes no facial expression. If he ever comes in to a classroom and he walks out he glances at me then out the door. He does it during exams too which I just feel he's staring at me and can't concentrate. If I'm sitting at a table with my friends he will go and talk to them but ignore me? I'm confused. Please can a boy/man/teacher tell me what this meansss!?
Ps. He doesn't teach me but I see him everyday around the place (hallways+supervising the lunch area+passing through classes to get things)
Does he like me? Does he think I'm ugly? Plus, I'm a shy person and blush a lot if someone's staring at me and don't know what to do with myself and while I was on a school trip, he stared at me and my friend even noticed it and told me... I don't feel annoyed about it I just think it's weird.