Struggling Christian: No Joy

Recently I meet with a friend who has just conquered apart of his life that has ruled him for years. He was so full of joy, excitement and fervor that lit up the room. Yet I was not joyful. I was happy; I want to tell the world that this person won against satin. Yet sitting there I just did not feel that joy. Those of you that have experienced that Joy know what I am talking about, the one that you get for just taking another breath. Yet for the past few days I feel like I cannot breath; that there is something here choking me. I do not know what. Is it that I am not doing what I was intended to do? Am I living in according with my gifts and talents? Yet what are my gifts? I do not know what my skills are. I feel like I am wasting away in a routine of every day without vacation? How do I know I have a vocation? It is because I have a Caller. So now it is a matter of finding my vocation to experience that Joy that I had long ago. I just feel I need a change; yet to change what?