It's been a long time, italki.

This journal includes things that happened yesterday.

[or This journal includes things from yesterday].

Yesterday, I made an account with Citi Bank.

I'll need one since I'm going to be an exchange student.

When I saw my new check-card, I realized that I'm really gonna go to America!

My friend who has only a few days untill he is going to the US, told me that he feels uneasy, that things feel surreal, and that he doesn't wanna go anymore but stay here in Korea.

At the time, I couldn't understand where he was coming from.

We've studied together for several months in preparation for the TOEFL exam and we sincerely hoped to study abroad.

However now I can. I can totally understand his mind now. 

Omg, only 20 days are left!!!!

Hope you found my corrections helpful. I wish my Korean was as good as your English. Cheers!