How do I tell my parents that I have social anxiety?

As you know, I'm 14 and I have social anxiety. High school life for me has been a living hell. I constantly worry about what people think of me and I am extremely afraid of being judged by other people. I am certainly most comfortable alone where no one can judge me. I actually already told my parents twice about this, with failed results. It turns out that they are extremely unsupportive of me. They say "It's not social phobia, it's just that you are quite shy, you need to talk more." and one time I was telling my parents that people keep making fun of me because of my weight (I'm extremely thin I have a high metabolism), they instead say "Thats why you should eat more and do some sports". Then, there was also a time when I tell my parents that people keep noticing me and I feel uncomfortable then they say "Why do they have to notice you? You are not even famous." I'm really tired of this. I dont want to live a horrible high school life. And summer break ends in about a month or so, I want to be social phobia free when I go back to school. I have talked to the counsellor about this and turns out I can't trust her. She told another teacher about the anxiety problem that I have. So what should I do? I want to be cured!