You have an Apple ID, but no iCloud account. In order to create an iCloud account using this ID you will have to change the present ID to a functioning email address which cannot be an @icloud.com address. Once you have changed to another ID address, you can use that to create an iCloud account and an @icloud.com address to go with it. However you cannot at any point make that @icloud.com address the ID.
What you can do (though I don't advise it) is to create a new Apple ID and iCloud account at the same time, using the account's @icloud.com address also as the ID. For details on how to do this please see Imp68's post here:
Re: I wish to transfer my Apple ID to a new iCloud account
I do not recommend this because there is a definite security risk in making the the Apple ID (and thus iCloud login) the same as your published @icloud.com address - any malicious person can lock you out of your account by persistently trying to log in with invalid passwords.
Furthermore if Apple needs to contact you in the event your account becomes inaccessible, and has only that account's email address to do so, it will not be able to contact you leading you to need to go through the whole Support fandango. So if you really want the login to be the @icloud.com address you must create another contact/rescue address using a non-Apple email address.
I would recommend getting an email address (such as a free one from Gmail or Yahoo) and using it only as the Apple ID.