If you've done the work, but are afraid of making it public, begin by showing it to a trusted friend or two. From there, you might advance to a support or critique group, then to a small publication or local exhibit, a web site, and so on. If you lack the skills you need, make moves to get them. When I coach beginning writers, they're often discouraged that their first work isn't all that inspiring. I remind them that writing is a skill that needs to be developed through practice, and often a writer's first published novel is actually the third or sixth they've written.
Classes can also be helpful in acquiring skills and receiving encouragement and feedback.
Some goals may require a certificate or degree that takes time to complete, and planning ahead can be helpful. A great example of this is a psychotherapist I met who had been a professional ballet dancer. She knew her career had a short life, so while she was still dancing, she went to graduate school. Look at some of the things you're doing now or that you've accomplished in your life. Short of being a Mozart, most people's work, along with their life skills, confidence and wisdom, grows and improves with time.