Describe what you want to do
I have found that most people want to do something, but don't know exactly what. They get very vague when you ask for clarity.
What do you want to achieve? Take some time to describe your dream, and, preferably, write it down. For most people, this is harder than it looks. It doesn't need to be perfect, and you can improve it you go.
If you are quite pragmatic, you'll have something clear that you can focus on. If you are idealistic, the real world will probably mess up your picture later on, but you will have a good idea of the values for which you strive.