Why does my teacher keeps looking at me when im not looking ?

well.ok lets start from the beginning. first year I had this teacher it was ok. I used to answer his questions and get ok grades. he's really nice, I used to think. but here comes next year, and first time I see him is in the auditorium for a school meeting. I totally forgot about him during the summer, well forgot about everything that has to do with school. so ok, we were in the auditorium and he, n his class came a few rows in front of us on the right side of the aud. before he sat he looked at me, and I kind of noticed an appearance of a hidden smile. I was confused so I didn't smile back. so after the meeting, I had his class. he was standing in front of the door a couple of steps out in the hallway. I think he tried to smile or greet me but said nothing. so I briefly looked at him and gave a smile that just faded as soon as I got to class. I think he noticed.so everything went on until a few weeks into school. then weird feelings came in. or maybe its him. he looks at me different. just and observable, shameful, and "I know the real you look. it kept going on until I started thinking of it every second of the day. I used to get headache of it. just the actions he used to give me. his looks, how he moves, him standing in front of my way to look at him when taking notes. this is still going till today. I feel weird. he always looks at my chest when coming near me and im not looking. he's a very intelligent and a smart person, I truly believe that. that's why he takes his actions carefully. like when im drawing something, he try's to see what im drawing. and quiets down when I whisper something to the girl sitting next to me, or takes a while to answer my question, hardly any. and today I was really yawning and posed to rest my head, so he raised his voice just to note and to wake me up. sometimes I think that he thinks im doing drugs or something. but I really don't. and I remember I think yesterday on my way going to my bus, I saw my friend and he came out of his class to my friend I think. I gave my friend a hug and noticed him and told him bye, but he just looked at me for a second and he turned around and walked back to his class. I was just dumbfounded. I truly think there's something happening with him, because I never feel this way to any other teacher. please I need someone to help me to understand my situation. anyway im intelligent too, but im weak in social problems. someone out there give me something to understand and let the worry out.* anyway in middle school and the difference between my teacher and me is 22 years... no way of a love connection...~