Sometimes I want to grow up quickly. 

有时候我会想要快速长大。

So I can be an adult and enjoy their moment. 

这样我就能成为一名大人，享受他们的时刻。

But my parents tell me that being mature needs to pay some price.

但是我的父母告诉我成熟是需要代价的。

I sometimes will make my parents angry, because I make the mistake.

有时候我会让我的父母生气，因为我犯了错误。

They tell me that it is the price of growing up.

他们告诉我这就是成长的代价。

Being mature means I have to learn from the mistake.

变得成熟意味着我不得不从这些错误中学习。