Your profile, and any stories you publish on Vocal, are public and are visible to anyone who visits the link, not just Vocal users. Currently, there's no way to make your profile private—you earn each time your stories are read, so restricting the amount of people who are able to see your stories would potentially affect your earnings. However, some of your information, including your email address, your liked stories, your unpublished drafts, and your Stats or earnings, are not visible to anyone but you.