Oddly enough what I think distinguishes a “real writer” from “someone who writes” is the ability and willingness to rewrite.
It's from Gina Barreca, who goes on to say this:
When you hand someone something you love, something you’ve poured your heart into and the first thing they say is, “This is a good start,” your instinct might be to impale yourself on the nearest sword — after all you’ve just given somebody the best thing you’ve ever done, and they’ve told you that you might have made a good beginning — implying that you might have a long way to go.
The amateur will recoil and defend; the professional will take a deep breath and say, “What do you think I could do differently?”
Those are really hard words to say. ...