As Gregg Krech writes in his book The Art of Taking Action: Lessons from Japanese Psychology, external reality remains exactly the same after your decision to ask someone out, to write a book, or leave your job. What matters is “creating ripples”, as he puts it — actions, however tiny, that alter things in the world outside your head.
Make a list right now of 10n things you can do that will make you feel productive. This is your “Plan B”. When you procrastinate, stop doing Plan A and do anything from Plan B. This will compound over time, making you the most productive person on the planet.