A lot of people never reach their potential because they're afraid of success as much as failure. Even those who've 'made it' have fears that hold them back.
Banish your Fears.
Replace Fear with Fortitude.
The will to try. The will to keep moving forward in spite of the things that scare you. This is what will help you.
If you need to, keep a mantra in your head. Or whenever you feel a fear creeping in, replace that fear with something better, i.e. a song that gets you pumped, an image of your future when you succeed, the feeling you'll have when you've made it.
It'd be a shame if the world missed out on what you have to offer.