把这句话翻译成英文，有些难，谢谢了

部分我采取了移译
Do yourself a favor: please being happy! Despite any frustration or unpleasant might happen, please smile to yourself. "Hey, what's that? Does that matter?" Being able to live in the world, is already a good issue to feel being satisfied.
Since we only have life fulfilled with brevity, do not try so hard on oursleve!
Once you have the faith, everything will be lucid
个人不是很同意楼上的一字一句的翻译,语法里面很多Fragment 以及run on

Gives itself a request; I want me to be happy! Even if has had the matter which anything lets you not be convinced or be depressed, must to own smile: ” what at the worst has?”Is living is happy. The life is alive, why must feel embarrassed oneself. So long as in the heart has this faith, believed that all can become bright.

To own a request I want me happy! Even if what happened to you unconvinced heart or blocking things, but also of their smile: "What is the big deal?" Alive is better. Living life, so why should