Depressed with life. I am not like that?

Hi, My name is Shantanu age 25 living in bangalore. My question is I feel sad depressed daily I am not happy with my life, I don't know how can I live life in positive way. When I wakeup in the morning I feel depressed. I have very bad experience in the past and my past is still haunting like a ghost. How can I overcome it??? I also become too much emotional and sad and even cry when I see other people how they are happy and enjoying their life and when I compare I feel how I am inferior person . I don't have friends. Kindly guide me How can I overcome my past??? Some of my family members make my fun that I am worst person How can I deal situation??? I am comparing with me to other person how they are better and I am not like that??? Day by day I am loosing my interest and self confidence.