I confess that I feel a little similar. However, much of my social anxiety has to do with what my focus is on. Am I focussed on what others will think of me and concerns about my self, or am I focussed on altruistic thoughts of compassion and peace for everyone including my self.
The Dalai Lama said that a very effective way to instill courage and confidence in yourself is to generate an altruistic motivation for the things you do. For example, if you are feeling nervous around a large group of people -or even with one person- spend some time beforehand contemplating love, compassion, and the sincere wish to benefit others. Filling your mind with concern for others leaves little or no space for egotistical worries like "will they like me?" or "what will happen to me?" so the communication will probably be more successful and satisfying. And even if the outcome is not quite what we hoped for, at least we can feel good about the fact that we acted in an altruistic motivation rather than a self-centred one.
...and what better place to contemplate such values than church? I mean, that is really the whole point of being there. God is not a judgemental God. God does not love conditionally. ...our view of God is very similar to our view of all people. And church should be a place where such values of unconditional acceptance are practised and where, if anything, people would ideally be shamed to judge or reject someone. Church is a refuge where every person should feel accepted, if just by the understanding that God accepts everyone. Forget forgiveness -the true God has nothing to forgive.
Perhaps your view of God, and with it your perception of how the world is, is mistaken and largely focussed on conditional love. And your God is a lesser one. ...well, actually, my belief in God is lesser also.
Maybe you could explore just what you truly believe about God and also what you think peoples' natures really are like. -Is God really judgemental and condemning? Are people judgemental and give their love and approval to you only under certain conditions?