What do you suggest if my depression. i hide behind a smile.?

Better not alone: It's best not to do it alone. With depression the most helpful thing to do is see a psychiatrist and/or psychologist to cope more effectively. It might be easier than you think. If you are already in treatment talk to your therapist. Hiding your depression behind a smile doesn't work and actually makes things worse overall. Ask again if you need more suggestions. Best wishes.