Hi I came to terms with my anxiety at about 24 years of age. I understand how you feel. The best thing to do would be talk to your parents or a close friend and go visit a Psychologist.
Each person is different. I had a major (For me at least) breakdown during the midst of a new house, job, and dog and relationship. I'm also deathly afraid of flying and needed to fly soon.
I had a major panic attack and literally felt so out of it that it was horrible. I saw a psychiatrist who prescribed me a low dosage of Xanax.
I visited some other psychiatrists (MD's who can prescribe drugs) but realized that I wanted to do this without being constantly medicated.
So I took my SUPER low dosage of Xanax and supplimented it with Cognitive Behavioral Therapy ( via a Dr who can't prescrbe medicine) otherwise known as a psychologist.
It helped immensely and I felt very good and quickly was able to manage my stress/anxiety without any need for meds.
The key really is finding someone you are comfortable with. I know there is a "stigma" that people who see "Shrinks" are nuts and weird. But really thats not the truth. You'd be surprised how many people do.
Anyways I'd start with a psychologist and maybe even a psychiatrist. Find one you feel comfortable with and start learning techniques.
Breathing is really key to anxiety as well as retraining your mind. I am by NO means fixed at all as I am in the midst of stress and hypochondria but I am helping myself by going to a professional for help.
You can do it too. If you have health insurance it'll be cheap too.
Its ok to admit you have a problem. In fact its admirable. I mentioned my hypochondria to my doctor and mentioned that I was restarting behavioral therapy and they were amazed that I was doing this. Not because they didn't think that I needed to, but because most patients ignore or JUST ask for drugs.
Anyways anxiety can mess with you in many ways. Good luck! And help your self by asking others for help