Let’s face it: Sitting at a desk and putting words on paper or a screen and then (hopefully) printing them out in a big block of pages that will (again, hopefully) not immediately end up in the remainder stacks, can be drudgery. So find some joy in it.
The only happiness one gets from writing is doing a good day’s work, of suddenly discovering something on the page which works. You pick up the page, you shake it, it’s there, it doesn’t come to bits, and you didn’t know it at the beginning of the day and now you know it. Now that’s a real happiness, and unless there is some element of that, well why on earth is one writing? Because otherwise moving a pen across the page is not all that enjoyable…