Where do you live?
You're 17, college for you must be different than college for us, we start at around 17/18
I think you live in NZ, your system is much different I believe
Anyway, I like physics and biology/botany, I had to take a year off to raise a baby so I started taking IT courses online from a college near me but probably not going to pursue it any further, I'm probably going to start with Bioinformatics then branch into Botany, education in Canada is going to be much much cheaper in 2017 though so it's good that I waited because I won't end up having to pay around $40,000