Writing can be difficult, very difficult. But something great to remember is that writing is difficult for everybody at some point or another. Almost nobody sits down and writes a perfect first draft. Writing is a process and it takes time. In the article "Shitty First Drafts", Lamott writes about how you should have three drafts. The first draft is about getting your thoughts down. The second about fixing it up and work on editing. And the third draft is to perfect it and fix all the little mistakes and for critiquing. I've never really wrote papers this way but after reading this article I agree with Lamott that it is the most efficient way to write a paper.
In the first draft, you just want to get stuff down. A problem I tend to have