Be flexible with your dreams and goals. The life you yearn for at 15 may not be the life you crave at 35 or 55. At 13 we wanted to be a professional hip-hop dancer, at 15 we wanted to marry a member of *Nsync, and now at 35 we dream of a bright future for our kids (and it would be really nice if they would also clean up their Legos before bed). You get our drift: your goals will change throughout life, because you will change throughout life. You have to roll with the punches; a little acceptance and a lot of flexibility can go a long way in getting the life you want.
Also Enjoy: Career in Gear: 5 Ways to Think About Professional Goals Right Now