Life is not fairy tale. Yes you have most likely been told you can be anything, but can you really. If you do not get a degree and did not finish high school can you be a doctor? No because that is not what you deserve to be. The quote is mostly saying you have to work to be what you want to be. If you ditch high school never even think about college can you be a teacher? No but if you work your way through high school get your diploma and go to college then you worked to be a teacher then you deserve to be a teacher. The moral is if you do not set goals and work for what you want you will not get what you want. If you always do what you have always done you will always get what you've always gotten.