Good Morning...loud and clear :)

Sometimes when I entered the classroom in the mornig, someone ocasionally said good morning and I was immediately flustered, ahem, err, yes..we'll see how good it is. Yesterday I entered the class, heard a good morning from a guy sitting at the front of the class (the door is at the other end of the room) and I replied with a loud clear good morning to you, how are you today! Yees...all the more because I felt something strange in the good morning situatio; nobody else in the class was talking to me or even noticed me enter and it felt kinda funny when heads turned towards me after my response.