Help me check grammar

It may be too long to correct/rewrite everything from your diary.
But if it is the thoughts that counts, I think your effort to write is good. Since you seems to read "English" authors and the Bible, they are good places for you to learn writing "style" and choice of words.

Anyway, here are only a few "critical" errors:
It’s okay on the whole. (as a whole)

I woke up especially (especially不是這樣用的，當你講及三幾樣東西時才會說especially其中一樣，這處可用quite/very便可以了，深一點又跟你原意近一點的可以用particularly) early this morning, at 7am, because I’d appointed (apporinted錯的意思，這字是「任命」，不是appointment的約/預約解，用to meet已經可以) a friend, Miky.

38-rountine bus -> route 38 bus

started to be more nervous and anxious->became nervous and anxious

I found the line from a signal and it’s just next to my old class
完全唔知你在說甚麼是line from a signal

I reached the terminal

She’d ever taught 9A and 10A students.
ever是錯的用法。我想你是想說她「曾經」教過的學生...。如果是想這樣講便要前兩句組合：The 9A and 10A students she had taught hve became doctors, lawyers, ...

Great! I have a learned and experienced English teacher.
learned是學來的東西，你的老師不會是「學來的東西」吧，應該是educated有學問/學養/學識 和 experineced有經驗。

Chris Jesus - Christ Jesus 基督的Christ有t尾，男仔名字Chris冇t尾。

I’d be regret. - I'd be regretful或I'd regret it.

our school heading of administrative affairs
HEAD of Adminsrative Affiairs

worthier
正確的相對詞是more worthy

The paragraph on Ch13 is perfect! Perhaps it is from the book!

I made him feel that he was not important so that he did not like.
so that用錯，你的意思是「因此」便用as a result/resulting that/therefore.

I feel revolted from what he did!
from錯，用by

at my spare time
at錯，用in

As your thoughts flows, try to organize and focus on one subject at at time. The book report part is quite good after correcting the grammar and I am able to become interested in this book by your introduction.

我推薦您一個非常不錯的英語學習網站，里面有很多非常不錯的學習資源：

http://www.hkenglishstudy.info

希望可以幫到你!