This is eye opning. You need some inertia to get up and running. Once you are in motion, its hard to stop. You write one word, you think about the next word and it makes a paragraph.
This is true that more we think about doing things, the more wemove out from the action. It creates a vicious cycle of overthinking and inaction.
Move out of thinking, start doing stuff it will make things moving and create a flow that is hard to stop.