I saw this one quote: "The people who smile the most are covering the most pain." I think this is true, just not with everyone. As I am really depressed and act like myself with my friends, but with my parents and family, I force a smile so they don't worry more than they do.
I did a test for my therapy session to see what level of depression I had. It came back with severe, 22/24, but I asked her to tell my mum it came back as moderate, saying I would tell her that my depression got worse. She went along with it, but I haven't told my mum and I now make things sound like I aren't as messed up as I truly am to my therapist.