He  learnt deeply in his life from his own experience that if a person goes at a job with determination and purpose, he may amaze himself as well as others by his ability. 老师，这家面出现了by为什么不用被动语态？ 是属于特殊情况吗？

这里介词不是表示被动含义，而是表示通过某种方式/方法/途径/去完成某事。

主语+be done by sb/sth  主语由/被..去做

The feast was served by his mother and sisters.

这顿美餐是他母亲和他的姐妹们准备的。

I was amazed by their discourtesy and lack of professionalism.

他们的无礼和不专业让我震惊

以上句子属于表示被动含义

(1)by sb/sth靠/用/凭

We'll be travelling by car.  

我们将开车旅行。

Dinners by candlelight are very popular with young lovers. 

烛光晚餐在年轻恋爱者中很收欢迎

(2)by doing sth通过/凭借做某事

Make the sauce by boiling the cream and stock together in a pan. 

把奶油和高汤一起放在平底锅里熬煮来制作调味料。

The all-female yacht crew made history by becoming the first to sail round the world.

这艘游艇的船员为清一色的女性，她们进行了首次环球航行，创造了历史。