I would firstly advice you to follow your gut feeling when choosing your study programme. Everyone is worried and nervous before starting university. Worries about not being intelligent or ambitious enough are for the most completely unnecessary and should not keep you away from applying for the course you like the most.
I would suggest that you join a student organisation. I play football for CBS Sport and I really enjoy this.
Hear the students' reflections on choosing their study programme and being a student on IBP. Feel free to contact them with your questions.