Don't be afraid of losing face, you need speak more.
不要怕丢面子，你需要多说。
Don't be afraid of making mistake, you can even learn from it.
不要怕犯错误，你甚至可以从中学到很多。
Don't be afraid of failure; failure is the mother of success.
不要怕失败，失败是成功之母。