It happens to everyone as they grow up. You find out who you are and what you want, and then you realize that people you've known forever don't see things the way you do. So you keep the wonderful memories, but find yourself moving on.
The very least you can do in your life is figure out what you hope for. And the most you can do is live inside that hope. Not admire it from a distance but live right in it, under its roof.