It's still a smile. There is part of you shining through, and it is saying "help me" which is why people ask you "are you alright?" Do not stop shining that beacon. Let others listen. You will guide yourself out of your misery, and into the fresh air.
Better get a hobby that you enjoy so that smile becomes real and then when folks around seeing you enjoy what is real to you, they naturally want to join you...:)