Why do i have to think about a career now?

I think we are thinking about careers now because when i grow up we have to think what we are going to do in our life. Instead of waisting time when i get older to think what job i want or if i was a person who gets all f's for everything and then worry about it when i get older and they don't want to except me.I think this project is going to help me a lot. Yes i have thought about my future. have you?