What do you think I should study?

Well I have to decide what to study and I am between a lot of things. I mean there are a lot of things I would like to do so I need your advice. The lessons I like at school are: physics, chemistry, biology, geology, modern history, and my favorite is design and technology education. I used to want to become a doctor but now I don't want so much because it needs more than 10 years to study it. But I wouldn't say no although. The other things I am thinking to study are psychology, geology or astronomy, chemistry. But I would like to know what exactly is robotics. Another question is: what else can I study if I LOVE fixing things, constructions, robots, or basically things about screws and welding? :D

Thank you ;)