Oh God! how I have to beat myself over the head to get started every morning. ~Katherine Anne PorterOf course, I assume she's being facetious or tongue-in-cheek, rather than literal; otherwise, it really would be rather painful.
What Porter alludes to is the discipline it takes to be a writer. It's not easy getting up every day, sitting in front of the computer or with a pen and paper in hand. It takes a force of will or internal drive. Writers are known to be great procrastinators. One who hates to cook and clean will find herself cooking and cleaning in order to avoid the writing that needs to be done. (I'm not referring to myself, by the way; I have other methods of procrastinating!)
But is a writer who doesn't write regularly still a writer? I think the question is rhetorical. In case you're unsure, though, the answer is 'no'. Unfortunately not.
I struggle to be disciplined. I'm not perfect, but hopefully I'm getting better. I find that routine helps. Not just to work at it every day, but preferably at the same time and in the same place every day. For me, that's at the computer in my living room in the mornings.
Do you need to write 7 days a week? Not necessarily. Five will do - whatever five days work for you. And three to four hours at a time or according to a certain page or word count.
Do you need anything special to get going? Music or the television playing in the background? A cup of coffee at hand? A particular pen or type of paper?
Find what works for you - a beating over the head if required - and do it. It's the only way you'll actually get anywhere with this craft.