I wrote a long term goal in 6th grade that I was going to go to Columbia or Princeton (I even bought a Princeton hoodie), but I got rejected to both come senior year of high school. I think as important as long term goals is setting short term goals that will help reach your long term goals.
I should have written "get straight A's in every semester" as short term goals. I thought I could get away with a few B's in my transcript since I took a lot of college level courses in high school, but I guess it didn't work.
Anyways, my long term goal now is to become a successful photographer before I turn 30. Short term goals? Find a photography internship every summer to help me learn the in and outs of photography.