Remember, friendships do not happen in a vacuum. There is a certain chemistry with friends just as in a love relationship. Therefore, contact with other people is the first building block of friendship. This happens when you share an experience. And you can not share an experience until you get out in the world with people.
People equal friends and friends equal people.
It is important for shy people to have people contact to make friends. Mothers need friends. Taking children with them helps mom grow friends. People equal friends. Some people have more trouble getting out there than others.