Having Fun?

I wanted exactly this. I wanted to be a PhD student and a useful member of the society. But now I am tired and have a lot of problems. This is just the end of the first week and I have so much things to do that I cannot fulfil. I have to create some things for my lessons and have to start my studies with analysing some books and articles. And I don't know how to start. I help everybody but who will feel that they should help me? I am tired.