When I was in eighth grade, I faced a similar problem. I was always reading because the class material bored me. I can't even tell you how many times my parents had to come into conferences because my teachers knew I was bored and thought I was being rude by reading. What the teachers wanted to do was give me harder work, but my parents told them no way because that would not be fair that I'm the only one having to do extra work!
Anyways, I didn't like grade school and I didn't really like high school either, but the classes did get more difficult in HS. Not terribly so, but it kept me busier. My schools were a little larger than yours but not by much. It killed me that the whole class had to slow down for a couple of the students who struggled, yet could not speed up to accomodate the few who were more advanced.
The good thing is that you only have four years left. I'm sure you can survive that. Try to take dual HS and college courses. Most schools have a program for that. Look forward to college! Its sooo much fun, and the classes are definitely a challenge. I feel like in college you are actually learning things, where as high school was just sort of like a place where they teach you things that you will only have to relearn once in college.
I was frustrated in your position too, but I bet you anything that the school is not accomodating you - not because they don't want to, but because they can't. That's the problem with small schools.
