I love it when I wake from slumber with this great idea for a book and write it down quick, least I forget about it! xD Being a writer allows me time to adjust my real feelings about everything. I am able to open up and pen mean notes about something some friend said or my mother said and then, I have the ability to shred it. What else can you ask for? You can't be instantly a super duper writer, it takes time to develop who your voice is, when you write.
As an undergraduate student I hired myself out to write articles for $5 each one, then I started getting work of mouth and became the highest paid American writer, writing the Queen's English. (Go figure)!! I am a contract hire now, as well as a paid adjunct at two online Universities. I love writing and have experienced all sides of the writing world. From Copy Editor, proof reader to spin writer.
I even have children's books, currently unpublished but in the works of finding a good place to publish with, may even opt for Kindle Self Publishing.
While I started as a writer and am still employed in a day job, its best for you to search out positions based on your knowledge. You want to go far writing, you have to be better than the next writer. Write short works, subscribe to Writing for Dollars (Dan Case) and learn the ins and outs of being really good.
Dedication, most don't have it, few do and those who get published all the time have diligently worked their tails off to be so.
Write every day, regardless of what you are doing, carry a small journal with you where ever you go, write it down, play with it and one day you may have the piece that lets you end your "day job" to peruse your happiness in writing.
Never, let anyone tell you, you can't do it. I never look back, always forward and I am still a work in progress and I have not given up my past time, but I am still again, just getting the voice of my inner writer together. ;-)
Good luck. :-)