I assume you created an iCloud account using your Apple ID (wich would be a different email address) then went to the Mail section and created the address you mention. This isn't the ID unless you change your ID to it.
Or you may have created an iCloud account not using a different Apple ID but creating this address to be the ID.
Once you have created an iCloud account and chosen an @icloud.com address to go with it you can't change the address (short of creating an entirely new account). If it's the ID you can't change that.
However, all is not lost as regards the address for email. You can add up to three 'email aliases' - these are additional addresses (not accounts) which deliver into the same inbox as the main account. (In fact it's a good idea to give out alias addresses, rather than the main address/ID, because if they attract spam you can easily change them - and telling people your Apple ID is a security risk.)
You should be aware before you start that once you've created an alias you cannot turn that address into a full iCloud account or move it to another account.
More information on aliases here: Add and manage email aliases for iCloud Mail on iCloud.com - Apple Support
In the meantime it's a bad idea to post your email address or your ID in a public forum and I've asked the Hosts to remove it.