You can learn great things from your mistakes when you aren't busy denying them. Read The 7 Habits of Highly Effective People.
You become what you focus on and like the people you spend time with.
What you do today determines who you will be tomorrow.
Sometimes people don't notice the things others do for them until they stop doing them.
Don't look for someone who will solve all your problems; look for someone who will face them with you.
Build your house on the rock of learning; no one can take your education away from you.