Hallo Hathel. Not only is your work here copyrighted, there are plenty of filters you can activate to keep your book to be visible to just anybody.

As soon as you create your item, you can immediately set it to visible only to

"registered users" or "registered authors". You can join peer groups which will review your book in return for you reviewing their work. Check out this link for such a group "The Novel Workshop" . There are several subgroups, one of which specializes in fantasy. You can make you book a group only item, in which case only the members of the group can read your book. In order to make a group only item, you have to be a member, so get in touch with those group leaders. Don't hesitrate to email me if you need more info.