For example, there's this girl at my school who is always smiling and laughing about everything. I've never seen her look upset. You could literally say something random like "bananas" and she'll burst out laughing.
Then I go on her Instagram page and it's all depressing quotes and captions about feeling worthless and about her suicide attempts.
Most Helpful Girl
Maybe they're trying extra hard to hide their depression0
Most Helpful Guy
Robin Williams (rip) has a pretty good explanation: