A first draft it not "just crap." It is a raw, unpolished story. It may have crap in it that needs to be deleted, changed, shifted around, but that crap is the essence of the story. Subsequent revision during the later drafts will give you more information on your raw story, so you can refine it and make it clearer. Some people describe the first draft as the "frame" of the house. Maybe the rough work. Each time you write, it becomes more like the finished project. A story or novel is both an additive and subtractive art. Some things are put in, others taken out, and the writing is made stronger as you get closer to "exactly" what you mean to say.
The only way that you can get to that point is by practice. like playing the piano, it is sitting down every day and doing it (butt on chair). As you become more confidant-- sometimes after years of failure, you will instinctively know what to put in and what to leave out. You learn this by anylising the work of other writers, listening to good advice, learing the design and structure of a novel or whatever form you are doing, and writing, over and over again.
Writing is not easy. Telling a good story may be natural to people, but NaNo is actually kind of tough because you come up with a story in the fly-- a lengthy story. That is hard even for the people who are good at it. I feel I am pretty good after 10 years, the first 5 years I wrote crap but I kept on it. I wouldn't have thought I could come up with 50K words in 1 month. I always thought 3 months at the least.
The most reasonabl thing you can do is try to figure out how you went wrong and what you can do for next year's NaNo. One thing I have learned is that you need to have the idea in your head well in advance. It has to be an idea with enough information to go 50,000 words, and you need to be interested enough in the story to sit there for a few hours a day to write it. I started by writing the typical 1,667 words per day-- I felt I knew the story well enough to speed up.
Whichis to say, even if you work slow, you must learn to pace yourself and actually write 1,667 words per day.
Sorry to get overlong, but making your wishes come true -- especially when it means learning an art-form takes a lot of commitment, and even struggle. You are on the right path, I wish I was where you are at your age, but I started to write much later. I went through the same uncertainty as you. I think we all have, the published among us, and the to-be published, and the people who just write because they love it. I am sure that you will do a much better job next November, so there is no need to feel blue about not finishing.
Learn to make friends with the inner editor. It is to be avoided when it keeps you from writing because of perfectionism (which can kill your skills in a heartbeat). The inner editor will also help drive your plot, and help you to be discriminating in your choices. It is not all bad, but should only be allowed to take control after the first draft is written.
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