Everybody has a calling. And your real job in life is to figure out as soon as possible what that is, who you were meant to be, and to begin to honor that in the best way possible for yourself.
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.
Getting older is the best thing that ever happened to me. I wake up every morning rejoicing that I'm still here with an opportunity to begin again and be better
Don't complain about what you don't have. Use what you've got. To do less than your best is a sin. Every single one of us has the power for greatness, because greatness is determined by service-to yourself and to others.