Why do you do what you do?

We all in life do things for our very own purpose such as, watching TV, playing games, etc. I play games and browse the internet, but the question is why do you do what you do?
Do you mean "what do you want to do rather what you do"? In life I only made the decision of what I'd want to do when I was 16 years of age and I decided upon the IT Industry. Now I'm working towards this in College gaining Maths and English qualifications