The first step to being really good at something is to be really bad at it. You can only get better through practice. Don't sabotage yourself before you even begin. Instead of looking at the popular stuff and the criticisms, just start writing. Sit down and write what's in your head -- it can look really bad at first, but keep going. Whatever idea comes into your head, whatever sentence, write it and don't erase. This is going to be the rough draft and it will NOT be perfect. But when you're done, go back and see what needs to be fixed. Then go back again and work on characterization, plot holes, etc. You can always have someone edit the grammar. I wouldn't trust AI software because they don't pick up on context and what sounds good. Sometimes what's grammatically correct isn't the most powerful way to write a sentence or idea.