I recently heard it called 'the never ending internal conversation" Ha!
That's good (and true). The best books I've read on this all have the same idea's regarding this. They say to be awre of the "internal conversation" and once you hear yourself saying negative things you need to stop yourself and dismiss it or change it to a positive. If you let the internal voice keep going on negatively it will destroy any confidence by building this lingering doubt about your game.