People don't post photos of themselves crying or being hungover or having a crappy day at work…they're always having the time of their lives. It feels isolating for me to see everyone else so happy so I stopped going on Facebook.

As for everyone being beautiful, apparently studies have shown that people appear better-looking in groups.

http://www.psychologicalscience.org/...-do-apart.html
The Cheerleader Effect - Scientific American