Believe in your story: In order to give your story a voice and bring it alive, you must first believe in your own story. If you don't then you'll have difficulty trying to put words on paper for fear that no one else will believe it.
Believe your story is worth telling: Every story is worth telling, and every story has its reader. So know that once your story is told, it will find its way to those it was meant for. You just have to give them something.
Reading is key: Read for inspiration. Read for style and voice. Read for lessons - to know what you like and don't like. Then find your own unique voice and own it. The best piece of writing is the one told in your own voice.
Pay attention to that tug: Don't ignore that yearning tugging on your heartstrings. It is the one voice you must listen to. All others are just outside noise.
Just write: If all else fails, just sit down and write a starter sentence. You'll be amazed at how the story will flow from there. Stories have a life of their own, and they will lead you where you need to go.
Write everyday: Once you get started, be sure to add a little to the story everyday. Then be sure to stick to it until you have a final draft - no matter how rough it is. Editors exist for a reason.
If all else fails, seek outside help. A writing coach can help you get started, and a ghostwriter can help write your story if you can't seem to find the time or lack the skills it takes to get it done. Whatever you do, no matter how you choose to tell your story, know that your story is valid and there is someone out there waiting to read it.
Have a blessed and fruitful week ahead!