Suggestion: Don't explain the metaphor, let the reader figure it out.
If you make the last two lines about you, the reader will understand the mataphor
Maybe something like this:  

i can't even crack a crooked smile,  
gloom sprinkles daily, keeps me in exile.  

This is only an example, though you can use it if you wish.
   write your own feelings.

And remember to paint a picture with your words not tell.

also you mention the same thing twice...
if the air is still, then of course the wind is not blowing. And vice-versa.
if the wind is not blowing, then of course the air is still.
This is a commen mistake that many poets make.
It's called "Tautology" 

I hope some of this helps your poem to become even better.