One of the issues that plague a lot of writers is the feeling that everything you write is terrible. And that leads to not writing from fear. Brienna talked about this a few weeks ago, and what applies to poetry, applies to writing.
One thing I’ve learned from Anne Lamott’s Bird by Bird (besides having “crappy” first drafts), is to just do short assignments in order to get into the habit of writing. Now don’t cringe – these aren’t awful homework assignments but writing prompts. A major problem that many of us face when it comes to writing is just sitting down and doing it. Writing prompts are meant to pull you from that slump and just have fun with writing.