Becoming a photographer is a good idea, although I don't know how exactly you'd study it. My friend, Katherine, wants to become a journalist and a photographer, and the main subject she will be taking is art. She'll take art all the way to university until you can branch off into photographic art. So I suppose art is what you'll need to concentrate on the most. I would strongly recommend going to college even if it isn't too necessary. Qualifications are everything to employers, and to get jobs you've got to have the upperhand on the other applicants. If you can do it, do it! Show off your skills and you'll go far.

I would recommend studying a variety of more solid subjects as well during school and college (like maths, English etc) so you've got a broad range of subjects to fall back on just in case things don't work out. Media and photography is quite an unstable jobhold for some. I'm sure you'll do well in whatever you choose to do, and good luck!