I wanted nothing less than to be a fiction writer when I was a kid. If you had told me I would be an artist or novelist when I grew up, I would have laughed in your face.
If you believe in what you are doing, then let nothing hold you up in your work. Much of the best work of the world has been done against seeming impossibilities. The thing is to get the work done.
Nothing stops the man who desires to achieve. Every obstacle is simply a course to develop his achievement muscle. It's a strengthening of his powers of accomplishment.