Do you have children? Just a thought, sometimes when I want to get over being antisocial I take my daughter to the park, shes still small, but I walk around with her, and she is learning to walk, so we practice and go on the swings.
Being shy or anti-social is all in our heads. We talk ourselves out of these situations to protect ourselves from the negative aspects of interacting with the general public. You just have to put yourself in a situation where you have to be social. A mommy and me group, a book signing, a night out with family members and their friends, anything. Just work your way into social situations. You can do anything if you just put your mind to it.. Don't allow yourself to make excuses about why you can't or shouldn't. Just dive in.