How

How do you just do this? Write what is on your mind all the time and be able to write a good view that people would want to see. How is it possible to write about the first thing that pops into your head and make that thought last? I think that my problem is that I am stuck doing little of the thinking and more of the thinking about what to write making nothing but a mixed head of confusion. I don't understand how some people can do this but others can't.

A few of my teachers have talked about how your brain can do all these things at once, yet right now I can't seem to think about anything but not being able to write about anything. I am stuck writting about being stuck.