The state of being

With the advent of internet there are so many things to learn and there are so many things to read. Although there is information everywhere but I never understand where to start with. For that I need to know what I really want from life. At times I think of reading about nature, the next moment I want to ready about travels. I am also interested in learning mathematics and rules of mechanics. I want to learn people management and i wish to understand emotions. I want to go back and prepare again for IIT. I wish to go to a good school/college and learn a lot more. I do not know what to do. where to start with.

Is life so complex for everyone ? Is this state of being confused commonplace? Is this dilemma everlasting ?

Questions of the aim of life keep haunting me. why am I living ? what is it that I would like to achieve at the end of my life ? what will satisfy my thirst of knowing things ? what should I sacrifice and to what extent should I go for it ?