What does it mean to be a writer? Is there a difference between being a writer and being an author? Is it possible to actually be paid to write?
There are a thousand questions that you may be asking when it comes to writing. Whether you're passionate about it or just trying to get your point made, writing can become a part of you.
One thing that might answer several of your questions is to ask yourself why you write. What most long term writers have to accept and place central in their careers is that writing must be done for the sake of the writing.
As you explore the different possibilities and needs in your work, you will see many avenues that make your book or blog or essay better that will cost you something. And not always money.