What's the karmic cause for shyness? What did we do in our previous lives to become a shy person in this life?
There are different types of shynesses.


shyness towards doing evil: This is a result of understanding that evil deeds are undignified and demeaning. It's an aspect of wisdom.
stage shyness or shyness to talk to people: This is a result of inferiority complex. It's caused by ignorance and aversion.