Parenting Preschoolers (3-5) Support Group
This community is focused on the joys, challenges and concerns faced by parents of preschoolers (3 to 5 year olds). The major areas of child development include: physical development, perception and sensory development, communication and language development, cognitive development, emotional development and social development. Join to share your stories and get advice.
Also, while I don't know your circumstances, like the others mentioned below...neighborhood play dates, Gymboree type classes and even preschool are great tools to help your child face his/her "shyness."
There are also a number of great books that I can post in the recommendation section of this community.
Wishing you all the best.