I think you are on the right track with both your understanding of the problem and your desire to get a handle on it now. I suggest you get some psychotherapy, it should be quite helpful.
Can you talk to your parents, doctor, or someone else about getting this started soon?
tg
I recommend you see a therapist and a psychiatrist. I know for me, SSRIs have been helpful to calm the worrying, sort of quieting it, and the therapy is good for figuring out better coping mechanisms. But definitely take this seriously--it's not something to ignore, but with the right assistance, it's totally manageable.
Good luck.