I think a lot of you are being way too hard on this kid. What's wrong with dreaming?
The constructive stuff in here is right my friend. Worry about the here and now. Don't lose focus of that dream job but in the mean time have fun growing up and experiencing life. If you don't you'll either 1: Be extremely dissapointed when you don't realize your goal or 2: Be extremely disssapointed when you look back and realize all the things you missed out on.