Did you volunteer at a race?

When I started out, I just rode a lot by myself. Now, 5 years later, I just ride a lot by myself . If you want to start riding events like centuries or charity rides, see if there's a local bike club in your area that has beginner rides that can teach you tricks of riding in a group, where you can train for the distances you want to achieve. Your LBS should know of some in your area, or you can probably find some riding buddies here.