Am I too sensitive?

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Do you get off work on time everyday?I get off work on time nearly everyday.Yesterday afternoon,I got off work just when the time's up.I said goodbye to my boss,and I noticed there was some displeasure showing on his face.Yes,I got off work on time nearly everyday while my other colleagues never get off work on time.Sometimes when I get home,and they are still at the office.But my job is different like theirs,I don's see any necessity for me to work overtime.But still,I notice that expression on my boss's face.I don't know if I think too much,am I too sensitive about it? I have nothing to do for most of the time,I'm quite free.I thought about quitting,but I changed my mind.I decide to learn more during my free time.I learn English,and photoshop most of my free time.But it seems my boss is not happy with it.Well,if he is not happy with it ,he can fire me any time he want,I don't care.I do my job,but I also need to learn and improve myself when I'm free.Am I overacted?Am I? Perhaps.Anyway I was quite upset yesterday when I got home,I was depressed.Maybe I thought too much.I think I need to stand though.Anyway,it's only a job,I just do my duty.What's matters to me,I need to learn more and I can make a change in the future.