When you wish upon a star you don't get Peter Pan and Tinker Bell. You get what you make out of it. If you believe in it hard enough and work for what you are trying to accomplish you will reach the goal to your dreams. It may not come as quick as you want it to, but it will eventually happen, and you will be proud of what you've done. Once you're proud of what you've done you will try to achieve more of what makes you happy until you feel like you've achieved greatness. So follow your dreams no matter what because no matter how big or small, they can always be accomplished with the right amount effort.
