When N Why ??

could anyone teach Me how to smile ??
I feel awkward when I am trying to smile..
I feel difference..
I feel hard..

My lips freezed..

I was missing My smile..
Where does It goes ??

I was trying to smile but It doesnt show that expression..
I was trying to smile but It is tough for Me..

I dont know..
since when and why..
I just only can sigh along falling tears..