Seriously. Severe anxiety and her answer is to "get over it"? That social worker needs to be smacked. And then fired.You're definitely not too young for "real" problems.
I ended up showing a few pages on AvPD to my social worker/councellor today, but she ended up saying that no one would bother giving me psychological tests because personality disorders don't develop until you're 16 (I'm 15), and she believes I only have severe anxiety, and just need to "get over it". So I asked her about talking to a psychologist and she shot that down saying she WAS one, and that social workers are completely identical to psychologists.
Having studied to be a social worker I can assure you that social workers are nowhere near as knowledgeable about psychological issues as a psychologist, unless they are specially trained in the area. Most are not.
Personality disorders may not be officially diagnosable until 16, but obviously the problem wouldn't have just suddenly appeared when a person turns 16. My problems were evident from a very young age.
I'd suggest you see a psychologist who specialises in the social anxiety area and is prepared to take your symtpoms more seriously than this social worker seems to be.