Affiliate Marketing Secrets

My life is heading in a direction I am not sure of.
I am a clever kid. I get good grades in school and have all my subjects on higher level and get good marks. I am planning on applying for university admission next year, but something is really wrong.
Everyone expected me to become a doctor or engineer. OR at least something worth studying for. (Studies are expensive). But I have another plan with my life. I want to go into advertising (with a focus on the art – Art Director). I am going to study for a BA (hons) in Visual Communications Design.
Well my problem is that no one, not even me, expected me to be interested in something like this. I don’t know if I’m making the right decision. Are there job opportunities for Art Directors (I know you work your way up). Do they pay well?
I always imagined myself having a comfortable life, driving nice cars, and always said If I become something great I can have that life (We are not the richest people).
Now I am totally interested in something else, something that probably doesn’t even pay well…
Am I making the wrong decision? Should I reconsider my future? I really don’t know what to do…
HELP PLEASE!!!! 🙁