Jamie. Babe. You are selling yourself so short. I'm an oldster at 27

so I'm going to give you two bits of advice.
First, high schoolers can accomplish amazing professional results even though they're still in high school. When I was 16, I started handling show dogs professionally. I was going to national specialty shows and raking in pretty good cash before I graduated. If you have the skill, the talent, and the drive to present yourself as a professional (and you DO have all of those things, HOLY COW, girl, you are amazing!), and if you're mature enough to take your work seriously as any professional should, then don't sell yourself short just because you think your age lends you some kind of un-credibility. The clients who will really matter to your future career will see past your age and look only at what you can do for them. So who cares that you're 16? (Almost 17!) You obviously know how to use a camera and you have the drive to make it in this game. Age is irrelevant at this point.

Second, raising your prices actually WILL bring in more clients. I know that sounds totally nuts. But clients do sort of "sort" their choices based on price before they begin contacting photographers. The clients you'll WANT to work for, who will treat you well and respect your talent and your professionalism, won't even look at a photographer priced in your range. Their assumption will be, based on their experiences in browsing web sites and in hearing from other people who've shopped around, that you're charging so little because you know your quality isn't up to snuff.
You are way up to snuff, so charge like you are. Your clients will increase, not decrease. It's crazy, but it really works. Obviously, there is a limit to how much you can push this little bit of psychology. I mean, only a couple of photographers in the world can get away with charging $20,000 for a portrait session. But you can and should charge more than you are now, because YOUR WORK IS WORTH IT. Age schmage, you have the know-how to make good photos, and you should get paid FAIRLY for your time!
Also, the more super-low-budget clients you attract, the more frustrated you will become with your clients. In my experience, the lower end = more bargaining and haggling, not less. Most people who shop by price are just looking to see how much stuff they can get out of you for the smallest amount of money - they are not looking to see what kind of quality is out there, and they are usually not willing to pay fairly for quality. If you price yourself in a more photographer-friendly range, you will not burn out on this business, and we'd all hate to see you burn out with such awesome talent (even though you'll probably be "stealing" all our clients in about a year

).
So, seriously. More confidence! You ROCK. You deserve more money for rocking so hard.