you're 12 right? unlike some people, i am gonna say don't give up on your dreams, but the dreams about art. you don't have to be so specific in what field of art you wana go to yet. wait a couple years, do some work experience in different areas of the art industry, then when you're older make your choice.
i have 3 artist friends. they all stopped studying art after high school (17 or 18 years old), they couldn't find any work cos basically, companies want more qualifications as no art is "original" anymore. its become like almost any other subject.
Now 2 of them are at uni doing some sort of art and design degree, and the uni sorts them out for work experience in games companies or magazine companies etc. They also both have a job lined up as soon as they finish their degree at the end of this year. One is actually off to Japan, and the other is off to USA.
back to the 3rd friend, this guy, i think he was actually the best out of the 3, but he's doing nothing with his life. he's still drawing, but noone is recognising his work no matter how much he tries to send to companies etc. He currently works in a games shop and has been there for 5 years.
basically, the point is, don't be in a rush. you still got time. making a career out of anything takes a lot of time and preperation...
good luck