the best treatment is going to be therapy of some kind. Many people with anxiety respond well to cognitive behavioral therapy. Basically you sit and talk with someone and sort out the issues that are causing you anxiety, learn new ways to cope with the issues and apply these new lessons to your life.
Given that you already know what is causing you anxiety, therapy will likely be very successful. At 16, you can still get thrown on all kinds of medications, anti-psychotics, SSRI's, stimulants (likely you may get diagnosed add/adhd even if you are not) and some day benzos. I'd really try to avoid taking any medication until you try therapy.