Probably around now, so 22. I have always been unusually shy and have always known that. However, in high school I always felt like I just needed a fresh start to break out of my shell. I felt that I was already pegged as the "quiet kid" and didn't want to draw attention to myself by talking all of a sudden; which is why I was waiting for a new start.
But as the old saying goes...a zebra can't change his stripes. I have had several fresh starts where no one knew me and I never changed favorably/how I wanted to. After all these fresh starts, I am out of excuses, and am now facing the reality of who I am.
Nowadays, I just try to be true to myself and to others. I used to take being called shy, quiet, antisocial, etc., as a huge insult. Now, I just openly admit it and laugh about it. Being honest with myself has helped all aspects of my life.
Before, I tried hard to fit in and it really didn't work. Now, I try to show others that I like them and I am interested in them. Its very hard to dislike someone that accepts and likes you unconditionally (just look at why people love dogs). It has taken the pressure off myself to fit in and made my life easier from a social standpoint.
I typed this on my phone and it went a bit off topic, but I liked this thread topic. Being shy/thinking you have SA versus actually realizing you do are very different things. I have been on this site for years (6 or so) but have just recently come to terms with the fact that I have SA