Sometimes people have a bad mood. Some people often have a bad mood. When someone tells you that you have it too often it won't change anything. You won't tell anything again but it doesn't mean that you won't feel like this  anymore.  Life is a mess for everybody. It has good moments and it has bad moments. And no one can choose for you how to feel even you on your own. Mood is a fickle bitch that's all. Live with it. We all do.