BUT SHE'S SACHA CHUA!
Okay, what's wrong with everyone? Every time I suggest doing something challenging, people who lack confidence will say they can't do it. And when I enumerate people who've accomplished it, Sacha often included therein, those I speak to will inevitably reply with this accursed phrase. I hate to break it to you people, but she is A HUMAN, albeit one with extraordinary dedication to what she loves. Certainly, there may be acheivements that she is more qualified to accomplish than others, but why should one let that stop him or her from trying? Here's a helpful hint. "Sacha can do something" is very different from "only Sacha can do something." The awesome things a person does are supposed to inspire, not discourage! Just because someone does something does not mean she is the only one capable of doing it!
I've said it before, and I will say it again: CARPE THE FUCKING DIEM. Why not try taking on that challenge?1 Trust me, though, it's never what you failed to do that you'll regret later on, but what you failed to try. Who knows? Maybe you'll do it, and maybe you won't. Either way, you'll come out stronger.
The lesson is simple: Have some more confidence in yourselves. The fact that someone you know has extraordinary qualities should NEVER prevent you from realizing that, perhaps, there might be something extraordinary about you too.
1 Necessary disclaimer: Note that this is directed towards those who lack confidence. If you're disinterested in something to begin with, that's a different story.