My diary(1)

Sometimes I wake up in the morning with feel fatigued when I woke up even though I had sufficient sleep sufficiently. It fell on happened again today. I forced myself to get up and then went  to the restroom bathroom [in private homes, this is what it is called.  In a public place, it's a euphemism for toilet.  There is no bath in those rooms!]. I looked at myself in the mirror - I looked like a wreck that I was. My eyes were caked with sleep and my thick white caked saliva got stuck around my mouth. I could barely keeping my half-closed eyes fully opened. , I turned on the tap on and water came gushed out. The moment my hand felt the cold water touched it, I felt cold a shiver went streaking [You can use various other ways to describe this feeling] thoughtout my body. I quickly took my hand off and moved the handle to the left flinched and turn the hot water on. My hand touched the running water twice and tested the heat of the water After testing the temperature, . I rinsed my hands in warm water, applied soap and made a lather. I started [too much details here to a common experience.  We have a Chinese saying, "When you draw a picture of a man, you don't have to draw his intestines too!"]and began to wash my face.

You have a knack in writing.  You bring interest to an otherwise mundane activity.  You can be a natural writer.  I suppose your Korean writing must be superb.  However, good writing rules apply regardless of language.

I would like to learn how to use better English expressions, so I hope you can help correct errors in my writing.

Periodically I have a day when I wake up with fatigue no matter how much sleep I get. Like today. I had to force myself to roll out of bed. As I trudged slowly to the bathroom and looked at myself (or: checked myself out) in the mirror I thought, “Oh man, I look like a wreck.” (or: what a wreck!) My eyes were caked with sleep gunk and a thick whitish substance had plastered itself around my mouth. I could barely keep my crusty eyes open when I turned on the faucet. The moment my hand touched the water it was like an ice bomb had decimated my insides. I jerked my hand away and shoved the handle to the left. It took two brave test runs before the temperature of the water was bearable enough for my hands. I rinsed them in the redeeming warmth and lathered up some soap. Then I started to wash my face…

Just an idea. I know it's different than a simple correction...

hope it helps.

It's quite confusing.... Imagine you are at X the present, A is the past and B is future.

A--------------------------X------------------------B

woke up                   This is how you feel.

had sufficient sleep.   You are now at X talking about stuff happened at A.

It is always good to picture yourself with this diagram when you are using mixed tenses.  For continuous tenses, imagine the action is approaching from A to X or from X to B. 

You can have complex situations of you being at X talking (you are going from A to B) about things at B and from B (though it is future but pretend that it is the present) talking about A!  For example,

I wish I will be well versed in English.  Then as I look back, how silly it was me that I didn't understand something that was so easily understood.

My diary(1)

Sometimes I wake up in the morning with feeling fatigued even though I sleep slept sufficiently. It fell on today Today it hit me worse than usual. I forced myself to get up and then I went walked to the restroom. Looking at myself in the mirror, I looked like a wreck. My eyes were caked with sleep and my thick white saliva got was stuck around my mouth. (< I don't know if this is what you wanted, but it's almost like a creepy visual) Barely keeping my half-closed eyes open, I turned the tap on and water came rushing out. The moment my hand touched it, (< Touched what? The sink handle?) I felt cold thoughtout throughout my body. I quickly took my hand off and moved the sink handle (< If you've already said what kind of handle -sink handle- earlier, then all you would need to write is "handle".) to the left. My hand touched the running water twice and tested the heat of the water. I rinsed my hands in warm water, applied soap and made a lather. I started to wash Then I began washing my face. (< "I started to wash" works here but "Then I began washing" is better.)

I would like to learn how to use better English expressions in English, so I hope you can help correct errors in my writing.

You write expressions very well in English! I saw a visual image in my head as I was reading this. It made me want to read more!! ^_^ I hope my few corrections are helpful. 

My diary(1)

Sometimes I wake up in the morning with fatigue even though I sleep sufficiently. It fell on today. I forced myself to get up and then went to the restroom.
Sometimes I wake up in the morning feeling fatigued even though I sleep sufficiently. This occurred today. I forced myself to get up and then went to the restroom.

Look at myself in the mirror, I looked like a wreck. My eyes were caked with sleep and my thick white saliva got stuck around my mouth. Barely keeping my half-closed eyes open, I turned the tap on and water came out.
I took a look at myself in the mirror; I looked like a wreck. My eyes were caked with sleep while thick white saliva had dried around my mouth. Barely keeping my half-closed eyes open, I turned the tap on and water came out.

The moment my hand touched it, I felt cold thoughtout my body. I quickly took my hand off and moved the handle to the left. My hand touched the running water twice and tested the heat of the water. I rinsed my hands in warm water, applied soap and made a lather. I started to wash my face.
The moment my fingers touched the water, I suddenly felt cold throughout my entire body. I quickly moved my hand away and shifted the handle to the left for warmer water. My hand touched to test the running water twice till the temperature was to my satisfaction. I rinsed my hands in the warm water, applied soap, and began to lather well so I could wash my face.

I would like to learn how to use better English expressions, so I hope you can help correct errors in my writing.

-Holly

P.S. I've learned and noticed that using difference sentence structures while writing is a skill that can be very useful. This way the pattern in your writing isn't the same; therefore, keeping the reader interested because your words flow better. The reader feels natural reading it.