Outward Appearence

Today while I had some down time I started talking to one of the RAs here at CTY. He commented, "It would be the saddest day if you were sad." I asked him what he meant, because I was confused, because I do not always see myself as being "happy". He then asked me if I was sad a lot, and I commented yes. Maybe actually not sad, but reflective and emotional. He then asked if I hid my sadness or my feelings, and again I answered yes. So odd I thought. We then entered into this discussion that he was a "hider" too. Meaning that everyone thinks that we are always happy, but that in reality we are just using happiness to cover up what we are truly feeling. I do not think that I do this all of the time, but I think inside I feel that I just come off like I am calm and cool. We later were discussing about shy people, and if someone asked me what I thought about myself I would say that I am a shy person, but in reality I am an extremely out going person. So, how does this happen? How it is that we see ourselves in one light, but we come off as another? There must be some psychology explanation to this. It is not that I feel like I am not being real with people, but in certain circumstances. Unless I act on my feelings then a person would never know what my actual feelings/emotions are. Hmmmm... thoughts?