I never never never give up like Natto!　けっして　けっして　なっとうのように　あきらめないぞ

I'm exhausted.
ちかれたあ

So I couldn't afford to write a memo like usual today.
だから、きょうは　いつものように　めもをする　よゆうがなかった

First of all, I also came back home early.   ("also" is not necessary here. You'd want to use it when you have a sentence followed by another, e.g. "First of all I left the house early, and also came back home early")
まず、きょうも　はやく　いえにかえった

Although I had taken a rest these two days, unfortunately I couldn't get rid of the fatigue.
このふつかかん　やすんだけれど、ざんねんながら　つかれを　とることが　できなかった

I have already accepted my physical and mental problems.
すでに　にくたいてき　せいしんてきな　もんだいは　うけいれた

Then, I wrote the below on Facebook to cheer me up...  (am I right in assuming したのようにかいた means I wrote it like what is below, i.e. "No matter how much I...."?)
それから　フェイスブックに　じぶんを　げんきづけるために　したのようにかいた

No matter how much many times (なんど = many times?) I failed the exam to get a job abroad because of my low English skills and how old I am ("old age" makes you sound like a grandmother! お婆さんのようにですか？), I will never never give up until I get it.
たとえ　えいごりょくの　ひくさ　と　たかいねんれいが　げんいんで　なんど　がいこくのしごとを　えることに　しっぱいしても しごとがみつかるまで　けっして　けっして　あきらめないぞ！

As for Japanese, "never" sounds like "neba" which means slimy in Japanese. (I think?)
Nattou is the most famous slimy soybean food in Japan.
にほんじんに　とって　never　は　ねばっとしたおと
にほんで　なっとうは　もっともにんきのある　ねばっとした　だいずの　たべもの

I know a little bit of Japanese; actually I'm studying it at the moment.

僕はちょっと日本語を知っています；実は今日本語を勉強しています。 :)

I will never never never (like Natto) give up!　けっして　けっして　なっとうのように　あきらめないぞ

I'm exhausted.
ちかれたあ

So I couldn't afford to write a memo like/as usual today.
だから、きょうは　いつものように　めもをする　よゆうがなかった

First of all, I also came back home early today.
まず、きょうも　はやく　いえにかえった

Although I had (taken a rest/relaxed) these past two days, I couldn't get rid of the fatigue unfortunately.
このふつかかん　やすんだけれど、ざんねんながら　つかれを　とることが　できなかった

I have already accepted my physical and mental problem.
すでに　にくたいてき　せいしんてきな　もんだいは　うけいれた

Then, I wrote it on the Facebook to cheer me up as/like below..
それから　フェイスブックに　じぶんを　げんきづけるために　したのようにかいた

No matter how much I failed the exam to get a job abroad because of my low English skills English and my high age, I will never, never ever give up until to I get it.

たとえ　えいごりょくの　ひくさ　と　たかいねんれいが　げんいんで　なんど　がいこくのしごとを　えることに　しっぱいしても しごとがみつかるまで　けっして　けっして　あきらめないぞ！

As For Japanese,"never" sounds is slimy.
Nattou is the most famous slimy soybean food in Japan.
にほんじんに　とって　never　は　ねばっとしたおと
にほんで　なっとうは　もっともにんきのある　ねばっとした　だいずの　たべもの

I will never never never give up like Natto!

I'm exhausted. So I couldn't afford to write a memo as usual today. 
First of all, I came back home early. Although I had relaxed these past two days, unfortunately I couldn't get rid of the fatigue. I have already accepted my physical and mental problems. Then, I wrote it like what is below on Facebook in order to cheer me up, i.e. "No matter how many times I failed the exam to get a job abroad because of my low English skills and age, I will never, ever give up until I get it.
I think "never" sounds like "neba" which means slimy in Japanese.
Natto is the most famous slimy soybean food in Japan.