A popular treatment for social anxiety or any anxiety is Cognitive Behavioral Therapy (CBT). According to CBT, our thinking affects emotion, emotion affects our behavior, and behavior affects our personality. It is our thoughts to events that made us anxious, especially biased thinking.
A website that is recommended by my psychiatrist to combat social anxiety, depression, or general anxiety is MoodGYM. It is a website maintained by Australia National University (ANU) and is based on CBT. There are activities and information. In particular, I liked the list of biased thinking:
Of course, CBT is not just identifying biased thinking, you have to read more here or do MoodGYM.It’s free.