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SoAn
One of the things that gets to me about writing is facing a blank page. Often at the beginning, it feels like I have writer's block and then anxiety sets in. I'm not scared to write, but having a blank page is uncomfortable.
My only solution is have a walk, or do something physical such as jump on the running mill. During that time I formulate the opening sentence. Something similar to a welcome or an introduction. After some physical exercise I have a clearer mind, and that is one method of writing the first sentence or paragraph if I'm lucky.
Before writing, do a list. Like a set of bullet points. Come away from your computer or desk and scribble on a notepad. It helps free up your mind while you're relaxing. Make some tea or coffee helps bring down those worried feelings.
I've never excelled at English so the school subject was never a strong one. But with time I managed to improve my writing and do so without anxiety. You probably need time which brings experience. But when ideas spring to mind, they set you on a course, like a ship steering.
I hope that what I shared can be helpful to you.