So While writing in depth descriptive passages may or may not be boring to some (I know I personally skip them to the good part) that doesn't mean you still can't put an effort into building your world in writing. What you don't want to end up happening is getting so descriptive that the reader pretty much lost the story trying to imagine every little detail you provide. This is also known as purple prose. The link provides a helpful passage on what it is and how you can modify descriptions to better suite your goals without over doing it.
As a world builder, I am sure this is not what you want to hear. You want to bring your world to life. The problem is... Not everyone can imagine the same. As I mentioned above... to make sure everyone understands the details of your world, you will end up having to write in so many minute details that it becomes a chore and breaks the flow of the story.
For the record, There is nothing wrong with creating your own language, your own environment and world. You can talk about plants and animals if they are relevant to the plot. In other words, if your MC is in a forest, and you start to describe the forest and all the birds chirping and wind blowing and all the animals running around, it takes away from what the MC is doing in the forest. However, if the MC is in a forest looking for some big monster, and he notices no birds are chirping as a sign that something dangerous is near by... that ambiance becomes a necessary part of that scene and the major difference that most people often misunderstand.
The world should be supporting of your characters. So if you have a world already done and you want to write a story about it, think about that world, it's pros, cons, environment, types of animals, it's setting and technology. Create characters that can fit into it. The the ability to relate has more to do with the character personality than whether a character fits into the world or not. There are many stories where someone from modern era is placed into a fantasy world, like Narnia as an example. As the characters went through the story, they adapted to the environment but we were able to relate to the characters due to who they were and how they were portrayed.