Adam, from my experience writers write because they have to. Artists paint because they have to. Coders code because they have to. They are driven by an innate creative spark. The number of people who actually get financial benefit from writing/painting is small. Coders fare better.
If you want to get into the game industry, start somewhere. Playtesting. Making mods. Something to get your foot in the door. I can almost guarantee you that 3D modeling, C programming, or vector design will get you a foot in the door somewhere.
FWIW I agree with Tom that writing may not be your strength based on the original post. That doesn't mean you can't find a fit in the video game industry.
I have done something similar recently for a game, and also for a story. It is not easy as you have found.
What I did to create the game world was to create an origin legend which is the basis for everything. It was 1-2 pages, nothing massive, just enough to really nail down the vibe of the story.
Then I based the main land masses on characters in the story, and based some some cities and mountain ranges on it too.
Then, and here is the key to both my game and story worlds, I found a public domain source to seed the vibe of the names. For the story I used wikipedia entries about Middle ages Bohemia and tweaked some of the names and storylines. For the game I used this: