Is it normal to feel sad when seeing other people happy?
I saw a video of a man unwrapping a present, and he was so happy, that kind of childlike pure happiness. First I felt it warm my heart and immediately after I felt a deep deep sadness. It happens every time when I see someone that happy, doesn't matter if I know them or not. I even get that sad when I look at pictures of myself when I was younger and having that pure kid smile. Why does happiness make me so sad?