Depression , Thinking. Happy in my life.

Hi Doctor, I always in depression. I always think what i like wont be with me. I faced this situation. In my whole life. I felt i am not worth of anything. I cant able to acahive anything. I always think my family wont support me anytime when i am in need. If they have any work with me then only they will come for that work. I felt they are using me. They dont have any love towards me. I have 2 sisters. If i want anythng they my parents dont hv for me. If my sisters want anythng then they always in there for them. I dont know why i am feeling like this. This feeling is der from my child hood. I dont even ask anythng to my parents. I am feeling like i am guest in my home. I cant able to share my feelings with anyone around me. Some times i felt more painful and i cry like hell all alone. This happend many times in my life. I am staying in hostel from my 11 standard till now. Now i am working in IT since 3 yrs. Pls help me. I dont want to be like this. I want to be happy in my life.