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    27 Things "One Tree Hill" Taught Us

    Exactly 10 years ago today, Mark Schwahn's teen drama that followed the lives of two half-brothers competing on and off the basketball court premiered. Of course, we're talking about One Tree Hill. Cue the nostalgia.

    1. The lyrics to Gavin DeGraw's "I Don't Want To Be"

    2. There are six billion people in the world.

    3. Expectation is the root of all heartache.

    4. Some people will walk in and out of your life.

    5. ... and there's not always an explanation.

    6. Some friendships are worth fighting for.

    7. Some aren't.

    8. People don't always tell the truth.

    9. ... but it's important to.

    10. Just because you're not related doesn't mean you're not family.

    11. It's okay to be who you are.

    12. But it's not okay to take things for granted.

    13. Say what you need to say.

    14. Don't believe everything you hear.

    15. Believe in yourself.

    16. Believe in magic.

    17. Believe in love.

    18. ... because love conquers all.

    19. You have to go after what you want.

    20. ... and never give up.

    21. ... because life is too short.

    22. ... and it goes by too fast.

    23. No matter how much you're hurting, it will always get better.

    24. It's okay to be fearless.

    25. It's okay to have lazy days.

    26. You matter. Your actions matter.

    27. ... and of course, your art matters.