There was a woman who wrote to me a few months ago about wanting to be a life coach but could not get started - she lacked the confidence. I advised her to give up the goal of being a life coach and to drop the fancy title - Life Coach - and simply help others in a voluntary capacity. If by helping others in a voluntary capacity her work expanded so that she one day found herself working as a life coach, well and good, but to start in the simplest low-key way possible and let her work advance from there. She wrote to me and said how helpful the advice had been and that a huge weight had been lifted off her shoulders. I feel drawn to give you similar advice.
I suggest you drop the high ambitions you are placing upon your shoulders and get in touch with enjoying writing and serving readers who share your interests. I suggest you write for a local free magazine, newspaper or booklet or write for a website on the Internet - some publication that serves your local community and which cannot afford to pay for professional writers. Pick a publication that you feel is doing a really good job in serving its readers in an area that you are vitally interested in. Approach this publication about doing a single freelance article for no fee and look no further ahead than that. You will then be acting in accordance with your own philosophy - to help others if you can.
When you go to write this article, see if it flows more easily? Do you feel more confident and self assured in your writing? If so then this is the right path for you. Continue with writing in a voluntary capacity and gradually increase the quality of publication that you write for. Eventually you may feel drawn to write professionally and at that point you will then have the confidence and experience to make the transition... but again, do the transition gradually - write one article professionally and build up from there.
It is a fundamental principle of inner guidance that if I feel drawn in a particular direction but lack confidence, and I am experiencing a drop off in my creativity, to ask my inner guidance, "What is the simplest first step I can take that will help me progress in the path I wish to travel?" Remembering this will help us progress, even when our confidence is at its lowest and we are speaking in negative ways to our vulnerable creative self.