You can learn great things from your mistakes when you aren't busy denying them. Read The 7 Habits of Highly Effective People.
Build your house on the rock of learning; no one can take your education away from you.
You are the average of your five closest associates.
Learn to love yourself first, instead of loving the idea of other people loving you.
No matter how good or bad you have it, wake up each day thankful for your life. Someone somewhere else is desperately fighting for theirs.