In our industry (and in some others, such as medicine) learning never stops. If you stop learning, you will eventually (and in fact rather quickly) become obsolete. My advice would be to set aside a certain amount of time every week (5-10 hours) to play with new technologies. Even if you don't master them, they can still give you valuable insights or teach you new paradigms.

There will always be someone who knows more than you or is more skilled. Don't let that bother you. Instead, use those people as role models.