Looking back ofat my whole life, I realisze that I have never ever to trytried my best ato do anything.

Thus, when I went to colleage, I always thought about life: why I was here, what I lived for, where I was going, etc.

When someone starts to think about all these things, his life wcould be easy to trap intofall into the trap of nihility.

文法上没问题，只是意思有点抽象，说his life could fall into the trap of nihility对我来收听起来比较自然。

I am thinking about themse now.

我感觉them一般来说人，不是用来说情绪或者想法，所以说these可能自然一点。

Looking back ofn my whole life, I realise that I have never ever to trytried my best toin doing anything.

Thus, when I went to colleage, I always thought about life: why I was here, what I lived for, where I was going, etc.

I didn't have any answer.

Or, "I didn't have any answers."

When someone starts to think about all these things, his life would be easy tomay easily become trapped into nihility.

I don't know what this sentence means, but I think it is grammatically correct :)