Why?

I couldn't figure out why the feelings keeps coming back.
The feelings,
I feel my English has been good but sometimes it has been worse instead, why?
It's so tentative!!
That's why I want to keep talking to native speaker (Canadians).
They can let myself improve my English with posthaste.
Whatever, I don't know.
But the interesting thing is, when I look back the previous post I made before, I can't distinguish where the grammatical mistakes are, and they are too obvious and made me laugh so hard.
I was wondering:"How can you even make a mistake here? you shouldn't make an error here seriously!?"

Final exam is coming, this means the first semester is going to end.
Time has passed too fast, my friends in Malaysia will be going to Taiwan to accomplish their dreams.
Wish you all the best!

Luv you guys!
Be optimistic!
Be tough!
Don't hesitate to get further information!