You're too pessimistic.

你太悲觀了。

I disagree with your pessimism.

我不贊成你的悲觀態度。

I have lost hope for the result. （not hopeful about）

我對結果不抱希望。

I don't want to be infected with your pessimism.

我不想被你的悲觀主義傳染。

A: George, you're about to play, do you have cold feet?

喬治，你馬上就要上場比賽了，很緊張嗎？

B: To be honest, I'm not nervous because I'm not very hopeful about the game.

說實話，我不怎么緊張，因為我對這場比賽并不抱什么希望。

A: Why do you say so? I've never heard you say such pessimistic words.

為什么這么說？我從來沒聽過你說這么悲觀的話。

B: I say for a reason. The player against me is much stronger than I, and I'm really not confident getting the better of him.

我這樣說是有原因的。和我對決的那位選手比我強壯多了，我實在沒信心打敗他。

A: Come on, how can you grow the aspirations of others to outdo yourself. Didn't you beat someone stronger than you before?

拜托，你怎么能長他人志氣滅自己威風呢？你以前不是打敗過比你強悍的人嗎？

B: It's different this time. I'm facing with the boxer called Tyson. So far, he hasn't lost all the cumulative competitions. Isn't it horrible?

這次可不一樣，我要面對的是一位叫泰森的拳擊手。到目前為止，他在所有的累積賽中還沒有輸過，是不是很可怕？

A: So what? You have your own strengths. As long as you give the flexible advantages into the play, I'm sure you can make it.

那又怎么樣？你也有自己的強項，只要你在比賽中發揮自己靈活的優勢，我相信你可以成功的。

B: My advantage can hardly stand a fight before him.

我的優勢在它面前簡直是不堪一擊。

A: Your idea is too pessimistic. Clear it up quickly.

你這個想法太悲觀了，趕快把它清理出去。