What makes you great as a profan/progeek – or a fan/geek/otaku that wants to turn their hobbies into a job?
The fact that you know this.
Seriously. You, from your love of anime to your disturbingly deep knowledge of sports statistics, have an idea of just what you want to do with your life. Your fanfic, fanart, web pages, blog posts, reviews, what have you all give you a bloody good idea of just what you should be doing in your career.
Right now you're lucky. Right now you have direction. Right now you have something you care passionately, deeply, obsessively about and will push yourself to achieve. It could be anything from finishing a video game to writing a web page.
But you care and you know what you want to do.