Billi,

I also have social phobia and huge trust issues. It takes me a long time before I call someone a friend.
Here's what has helped me, for what it's worth. Instead of focusing on whether someone likes me, I focus on if I like THEM. Do they have similar likes and dislikes?
Are they non-judgemental?
I think it is better to have a couple of true, good friends then many aquaintences.
You are a unique person---remember that. You are cared about here and listened to.