When you study writing enough, almost everything begins to look like a plot device, a contrived foil, or whatever. Learning the art of writing, especially fiction, can interfere with the enjoyment of reading.
However:
Don't think you're not good enough to write well.
Remain aware INTP writers tend to explain too much anyway.
A process to aid you: Write one chapter a day. This will keep you down to 2,000 words a day or so, which is not much, really. The next day read what you wrote the day before, adjust it briefly - you may need to give yourself a time limit or you'll find yourself spinning your wheels - then immediately write the next chapter. That helps continuity and "stupids" when you blank out on something.
Conversation carries writing forward for most people. Dialogue among characters, not exposition.
Structure matters. A modern paradigm is to end each chapter leaving the reader with a puzzle, an unresolved crisis, something to turn the next page. A number of early novelists started out writing not novels, but serializations published in weekly newspapers - they had to lay things out to make the reader want to buy the next edition, otherwise their value to the publisher was less. Out of that necessity you get the virtue of books like 'The Count of Monte Cristo' by Alexandre Dumas, written 1844 as a serialization in a Paris newspaper. It is worth reading the book for the relentless structuring, although the prose may leave you blind and gasping. It is worth reading about Dumas, also; he had the advantage of living and participating in interesting times, which leads to another point: Write what you know about, and if you don't know enough about something, learn about it, even if you have to actually talk to a human being in the field you need to learn. Every successful author does this. The reasons are many, but paramount: Give your readers good value with good information, even if the information is en passant or background; don't expect readers who find you making mistakes in topics they know about to put up with it. Nothing like a WWII novel that puts a general who was in the Pacific in charge at Bastogne to drive away your audience among WWII buffs, for instance.
Good fiction is just storytelling on steroids. If you want a good example of a solid writer enjoying commercial success just by richly telling good stories about interesting people, try any of Craig Johnson's 'Longmire' books.
There is a lot to learn, but there is also nothing to stop you from getting started.
Caveat: I have talked to successful authors who benefitted from sharing writing critiques with groups of other aspiring writers, and to those who said the process was corrosive and marked by gratuitously cruel comments from writers jaded by their failure and eager to make everyone as miserable as themselves. So be careful with that.
