worthless and alone

I have been feeling so worthless and alone. I have no friends. All I have now is my parents. They guide me and help me. But I still feel so alone. Being so alone just makes things worse for me. I think too much; too much about death. I think about my own death and how it would affect others. It would effect my parents but that's about it. They are all I have left. I have lost one of the only friends I had, but I barely even care. At certain points I feel satisfied being alone. I don't have the pressure of relationships. I only have to impress my parents. I know I have let them down. Life was so much better for me in the past. I think about my worthlessness a lot. I always feel so worthless. I think about how unimportant I am. I may mean a lot to my parents but that's about it. Inside myself I scream so much. Sometimes that's all I can hear is screaming in my head. It's as if there is something on the inside screaming to get out.