Writing isn't a transcendental, mystical experience - it isn't about a feeling of magic when the words miraculously appear on the page. Writing is fucking hard work. Years of fucking hard work. Decades of it.
Writing is getting up early for the day job after editing your latest novel well into the wee small hours. Writing is squeezing in a few hundred words on your lunch break while your workmates are trying to bug you with trite comments about last night's TV. Writing is sitting at the dining room table working on a chapter while your wife tries to talk to you, and sitting with you laptop on your knees while your kid plays at your feet. Writing is sitting in front of a computer long after midnight, when you really should be sleeping.
Writing is like making a cabinet or putting up a shelf. Everything has an order, a sequence, and it's important that the right parts go in the right places. Writing is making sure you don't lose the screws or misplace the screwdriver. Writing is all about learning a craft that might just produce art.
Writing is what you do when you don't know how to not write.