My true self

I have always wonder why many people see me so differently from how I perceived myself? In their eyes, I am always a tough person while I always feel myself vulnerable. For them, I am always very active and talkative, yet most of the time, I find myself rather spending time at home, and stay quiet in a big group. Most of the times, I don't share my sorrow simply because I don't want to put burden on anyone. Being nice does not mean that I won't get hurt or nothing matters to me. I am getting tired of being the nice person...may be next time I should reveal my true feeling more...to shout, to cry out and to show the pain