Sometimes, when I'm just really sick of feeling like crap, I do pretend, because I read somewhere that if you pretend long enough you might start to believe it and it will be true.
That has never really worked for me though :roll:
I am also extremely worried about how my behavior affects those around me, and when I start to notice that I am making other people sad I pretend that I'm fine. Being outwardly depressed also causes people to pay attention to you, sometimes you'll get people who want to "cheer you up", and all that attention is scary! So I just lie and say, yeah, I'm all better now. It's easier to be one person in front of people and your regular sad self behind closed doors. But then you start to feel isolated because nobody knows the "real you", nobody knows or understands your reality. It's just a big vicious cycle. You know what helps me the most? PROZAC.