If I had waited, I might have lost my nerve.

我要是再等下去，就快疯了。

I was here before, but I lost my nerve, and I'm a singer.

我来过这，但我吓破胆了，而我是个歌手。

And 15 would come and go, and I'd lose my nerve, and then I would decide on 16.

然后十五岁很快就过去了，但我没有勇气说，接着我就决定等十六岁再说。