I've suffered from anxiety for just about the same amount of time. My anxiety, as I assume, comes from my past experiences of bullying. All from being attacked by a girl and having her friends watch, to going 20 seconds without realizing my pants were down at recess. I guess my anxiety also comes from the fear of being judged, and embarrassing myself in class or anywhere, rather, in school. Ive come a long way, even though im only in the eighth grade, and anxiety has just ripped me to shreds. Friends that I've made, the nicest ones too, have strayed away, because I cant squeeze more than "hello" out of my mouth. But, what has helped, miraculously, is prayer, and meditation. I still have nervous twitches (which is the most...the worst thing.) but it helps the most when I meditate the night before school. Anyway, try meditating or praying to your God, if you're religious.