You should probably stop here. It's too much work.
But what if I told you that you could pick up your favorite pen--c'mon, you know you have a favorite!--or your laptop and GO? You don't have to have the perfect beginning, middle, and end. It's not likely that you'll sit down with a cup of coffee and plunk out War and Peace on that first go. What stares back at you from the page might suck, and "suck" might be the understatement of the century. But even stories sucky-beyond-all-reason can be shaped into something more. A blank page cannot, at least not until your words end up there.
Though I've always written for my own enjoyment, I never considered anything would come with it. Writing would be nothing more than a hobby. In 2011, my attitude changed. I wanted to take writing more seriously, to write books instead of rambling blog posts about coffee and kid-induced nervous breakdowns. And then came that day when I said, "Enough! I'm writing a book!" I didn't even have a story in mind, I just followed Chris Baty's advice and wrote the book I wanted to read. My first words after my attitude adjustment were,
"I'm what you would call a simple girl, a chameleon."
If you think about it, that sentence doesn't make sense at all. Simple girls have nothing in common with ever-changing chameleons. And, if we're being real, it's a bit cliche to call yourself "simple". But those flawed words led to over 200,000 more. With a lot of hard, literally hands-on work, they have grown into stronger, more flexible versions of themselves. That never would have happened if I'd let the blank screen call my bluff. I wade through the suck every time I sit down to write, and you will, too. In the end, it's not about whether the writing is excellent or cringe-worthy. It's about letting the ideas out of your head and seeing what happens. It's getting past saying, "I always wanted to write a book/story/article/whatever" to actually doing it.
I can't read through that first manuscript without feeling sick to my stomach at its sheer awfulness, but I didn't let it stop me. That sheer awfulness became the first of three books in my Hope Creek series, which gained the attention of a publisher. While that might not happen for you, you can't possibly know for sure if you don't write that first word. And then the next. And then the one after that, and so on.
My advice to you? Go forth. Write all the horrible, wrong words. Laugh at yourself, and don't give up.
That's truly all it takes to be a writer.