A writer is simply one who writes words, Even if just 1 person reads it your work, or a 100, or 1million or 100,000 You are a writer.
All we can do is write, but its up to the reader to decide if we wrote masterpieces or empty silliness, and there is nothing you can do till another reader says different.
After writing, there is the letting go part. Perfection is a myth; as we all get better by day.Allow yourself to grow in active practice, release that book to the world, and do better with the next on...
Don't let society's defined genre hold you down, be a free spirit and just write, let society be the one to decide where each piece fits in.