What I'm going to do in the future?

What are you going to do in the future?
What do you want to study?
These are the questions I have heard more in this last two months. All the people ask me this and I always answer the same: "I don't have any idea, I'm too young to decide this".
But the reality is that I have to choose which kind of studies I will start the next year and for the moment I have decided to do "Batxillerat" in the same high school I'm now but I have decided this, only because after, you still have many options, and for the same reason I have chosen scientific option.