Writing In The Attic Rockwell Is Writing Something That Can Be Taught?

Is writing something that can be taught? - writing in the attic rockwell

I have an idea for a book. Well just an idea, I have characters, plot, story, etc. I want to stress, humor and even romance. Here 'the problem, I write a lot about him, but when I read, I think an amateur to me. Are there classes that can take to help develop my characters, plots, etc. Or should I admit that I have no talent and give up. PS I do not care if someone reads my book, I would only know in my soul and conscience as well, and maybe my kids are in the attic one day when I left. Thank you in advance for any serious response.