I have a difficult choice to make and why does my dad doubt me?

I am a High School student. I started learning the basics of business last year. Now its time to move to another city and its the time of the year where you apply for schools. Normally I would just apply for the same course as I was doing last year… to continue in that way but since I have developed an interest in web designing, photography and filmography its becoming more difficult to choose what I want to do. And adding to that I am also considering going into the IB. The school that I want to apply to has Web designing and business. And the other one IB. So I am stuck if I should choose business, designing or IB. At thing very moment I am leaning more towards business. My dad though doubts me that I really want to do business, he thinks I would enjoy web designing much more.
WHAT TO DO?