I was diagnosed as having social anxiety disorder but didn't know until a new psych dr mentioned it. I told him I disagreed with the diagnosis because I often feel no anxiety around people. I have not received an avoidant personality diagnosis but have not pursued diagnosis so I'm not sure. I've never met anyone in person diagnosed with it, not sure if that means it's rarer. I've also read that there's plenty of debate over whether it's an extreme form of social anxiety or separate diagnosis.

The reason I believe AvPD is more likely for me is because my social anxiety only kicks in when I fear someone is or could become closer than a stranger. I don't walk into a room and feel like everyone is looking at me or judging me but I avoid relationships with people. I also stay indoors alone almost to the point an agoraphobic would but it's my understanding agoraphobics often have co-occurring ocd (I could be wrong) and I'm not afraid of leaving my house I'm just tired of doing everything alone for so many years and sometimes feel overwhelmed by the thought of seeing the store clerk that now "knows" me.

IMHO, if you start treatment for symptoms like those in AvPD as a teen it's likely you'll never have the disorder. Personality disorders take time to form and I believe AvPD is one that might take longer than others.