Call It Dairy (Call what dairy? Dairy-a place where they keep cows or make milk and dairy products)

I think I really need a personal teacher to tutor my me in English this time now. Although I registered on Italki two years ago, I am going to use have not used this website efficiently until these days recently.

Before that, I am trying tried every way in self-teaching to teach myself, and to see how far I can go.

Actually, I haven't worked so that hard after the graduation graduating from high school. The fatigue made me feel excited and confident which is much better than live living idly. (Do you really mean fatigue, fatigue-exhaustion. Exhaustion does not tend to make people excited and confident, in fact, the very opposite is normally true.)

Call It Dairy

^ The title is very strange to me. I have no idea what you're trying to say, but I'm going to guess that you probably mean "diary" (as in journal) instead of "dairy" (as in milk/yogurt...) >_>

I think I really need a personal teacher to tutor my me in English this time.

Although I registered on Italki two years ago, I am going to use this website efficiently until these days.

This sentence doesn't make any grammatical sense. It would be correct to say "I'm going to use this website efficiently these days." However, taken in context with the preceding clause, the sentence still doesn't sound natural. I think I can guess your meaning, and I would say, "Although I registered on italki two years ago, I have not started efficiently using this site until recently (or until a couple days ago)."

Before that, I am trying tried every way in of self-teaching, and to see how far I can go could get.

Be careful, because even though we English-speakers generally aren't very particular about verb tense, the "before that" definitely indicates past tense.

Actually, I haven't worked so hard after the graduation since I graduated from high school.

The fatigue pressure made me feel excited and confident which is much better than live living idly.

This doesn't make sense semantically. "Fatigue" means tiredness so that won't make anyone feel excited..."Pressure" means 压力, which may not be exactly what you mean, but this is the most common word Americans would use when talking about rigorous schoolwork. I also would not use "excited and confident" because they have very positive connotations. I would say something along the lines of, "The pressure motivated me to work hard, so I learned a lot/made fast progress. Now I am living idly and have no/less motivation."