Unfortunately, that sometimes means you also hide things from yourself. You may find that your desire to remain guarded backfires, affecting your self-awareness. Why are you like this? It's possible that you act in this manner because of a deeply-rooted fear of being exposed, or of truly expressing yourself. To protect yourself from this fear, you act in the opposite manner — you are guarded.
There is a certain respect that comes with resistance, an unconscious understanding that the human psyche is very vulnerable. We all feel we have a lot to hide, and you are not one to be intrusive or thoughtless about how you approach sensitive topics with others. Therefore you inspire a sense of safety in others when they are around you. Your psyche is very deep, very rich, and the more you can let yourself know (both the good and the bad), the more you will be able to appreciate who you really are.