tec,
If you're in school there should be some kind of assistance offered. Talk to your guidance counselor about what your options are.
Talk to your folks as well and tell them what is going on.
The sheer amount of treatments and success for depression are staggering.
Action plan
1) make (and keep) appointment with guidance counselor for information on services offered at your school
2) Talk to parents - they can guide you on doctors/insurance/finances, etc
3) If all goes well with parents/insurance make appointment with primary care physician
4) Read up on symptoms/treatments to better understand the disease