"Thirteen Things I Don't Want You to Do" by Douglas Pagels

Don't~ stress out about things you have no control over.  Sometimes what is... just is.
Don't~ waste your days in emotional disarray over a negative situation that you can be in control of.  (Remember, you always have at least three options: move on, stay where you are and just deal with it, or turn a negative situation into a positive one.)
Don't~ try to fit in with the "right" crowd when it feels too forced.  The best friendships are the ones that are natural and easy and comfortable and kind.  Find one of those.
Don't~ be a part of prejudice against anyone.  Be colorblind and open-minded to the millions who have diverse beliefs and varying backgrounds.
Don't~ worry about you future.  It will unfold slowly enough and give you plenty of time to help you decide... all the wheres and whens and whys.
Don't~ feel like you have to put up with the people who are rude or obnoxious.  Always take the higher ground when you can, but if you need a release, take comfort in quietly thinking to yourself, "I'm really glad I'm not you..." and leave it at that.
Don't~ forget, though, that some people have emotional or physical things going on beneath the surface, and if we knew what they were, we'd cat them a lot more slack.
Don't~ ever forget the reckless behavior and cars are a deadly mix.  People forget that every year, and when they do, it's often the last thing they'll ever forget.
Don't~ be afraid to ask for advise.  There are people who love you and care about you and would like to help you in any way they can.  Be brave... and ask.
Don't~ be obsessive about your body and your looks.  You're growing and changing, and you are a work in progress and a miracle in the making.  the simple truth in the looks department is- some people are always going to seem better and others will always seem worse.  It's okay.  We're all different.  That's pretty much the way the world works.
Don't~ stop there; it's the same with money.  There are the have-nots, the have-a-lots, and everybody in between.  When your perspective gets lost and you're fretting about not having something "everyone else" has. remember, some can't afford the cost of anything.
Don't~ let cynical people transfer their cynicism off on you.  In spite of all its problems, it is still a pretty amazing world and there are lots of truly wonderful people spinning around  on this planet.
And don't~ ever forget: the teen years can definitely be challenging, but if you work it right... they're also some of the most memorable and most fun and most amazing times of life.