If friends disappoint you over and over, that's in large part your own fault. Once someone has shown a tendency to be self-centered, you need to recognize that and take care of yourself; people aren't going to change simply because you want them to.
There's a group of 12 oak trees on my property in California that I call 'my disciples.' Their branches form a canopy over the ground, and I sit underneath them for inspiration.
The single greatest thing you can do to change your life today would be to start being grateful for what you have right now. And the more grateful you are, the more you get.
I used to have a fake Louis Vuitton bag because I thought it meant something in life. But now I realize that all the things in the world don't define you. It's what you stand for, what you're willing to do, how close to the truth you're willing to be in your life.