Just write !

You know how sometimes you want to write something, but you're scared to make a mistake or you might write badly ?
Why is that ?
It's like wanting to learn to paint, but you're afraid to ruin the painting. You haven't even started yet.

With writing, it's even simpler.
Just start writing.
Write about anything, whenever.
You only need a computer.
What ? you don't have a computer ?
Then get a piece of paper, a scrap paper even, then use a pen/pencil and just write.
It's that simple.

Write down your ideas, your thoughts.
You can read it afterwards, you can even throw it out.
Just write when you feel like it, don't hesitate because you're afraid of mistakes/writing badly.
Just write.