I think my social phobia is just a side effect of being a caring and sensitive person. Because of my nature I was seen as vulnerable to some in the world and was sometimes treated in a way that caused me to perceive the world in the wrong way and also be afraid of it in some cases. As I get older and wiser I have learned how to protect myself better, and I am reverting my perceptions of the world back to a healthy state. But still I am caring and sensitive. This is not necessarily a positive for social phobia, but being caring and sensitive is a very positive thing in my opinion and I would not trade it for anything. I have come to accept my failings socially as a kind of price I have to pay to be who I am. And I would gladly endure my SP a hundred times over before I would accept to be anyone else.
One specific positive is it allows me to recognize and understand other sensitive people, even if they try to hide it (see comment above about why they would hide it), which has brought me enough joy that I don't even mind anymore that I get scared sometimes. My happiness is my own now, and there is no happiness vulture (as I call them) out there that can pry even a little piece of it from me. I dare em to even try.