It's pretty common for someone your age (and mine too, I guess) to be indecisive about the future. Just keep an open mind that there are literally thousands of professions out there and the number is growing everyday. Don't limit yourself to just one or two things you want to do.
Hopefully, but since I am considering being a architect I need to learn Art and Modern Technology which I hate! But I have more of a passion of becoming a doctor of some sort or maybe a scientist or a lawyer - OR a dentist. Haha; I know, I want to be a lot of things. XD
Probably. I asked my art teacher today about my portfolio and he saiid that I was the best student out of my grade. However, I showed him one of my pieces and he said for that it's only worth 60/100 :\ He said I needed to expand "style" and how each expansion can influence work and create artist personalitties and art "STYLES".