It's disappointing that you feel the need to hide your true feelings... how can others support you and know how poorly you are feeling if you hide it from them? They can't read your mind.

It's ok to tell the truth. Say you just aren't feeling up to going out or doing anything...then let them talk you into going with them even if you don't feel like it... because that's the way to overcome... a few minutes at a time of relief from the darkness... the light becomes stronger.