"Dont sacrifice what you want most for what you want now. Write down what you want most and see if often."

-Peter Vidmar 

If you want something, you should work hard for it. Start now. Do what you think will get you to your goal. Worry about your future, its important. If you want to graduate high school but  you currently have straights Fs, stop fooling around and study. Dont go out with your friends. Work on improving yourself. In a couple of years the only person who might still be with you is not your friends, its yourself.  Write down your goals in a journal, look at them everyday and think of them too. Dont just think of them, work to get towards them. If you want to be good at playing every instrument, dont just sit there starring at the instruments saying "i wish i knew how to play it" get up and practice. Practice for hours, days, weeks, months or even years so you'll get it right. the point is to not leave your dreams for later. Work on them a little every day before its too late.