Great job! Here are some suggestions...what you wrote isn't wrong but I think it sounds better like this:

How delightful it is to use English!!!

At the moment, I like using English. When I find a new expression (or upon finding a new expression), I try to use it more naturally.
Sometimes, I meet expressions which don't make sense to me. My teacher explained that it is because English is not a combination of words. A word must be used in context.

For example...
Drink a coffee(X)
Have a coffee(O)

Both of them are correct grammatically but the former isn't used. Who knows why they don't use the first sentence?? There's no reason. So that's why it is important to use a single word in context.

In English, we call words that just naturally go together collocations. There's no real real reason why we say :

It's just something that must be memorized. It's made more complicated by the fact that different countries sometimes have different collocations. British English can vary greatly from American English, etc.

There are some more basic collocations at this website:

http://www.englishclub.com/vocabulary/collocations-lists.htm