George Tsirkas

Please, use better English grammar because I can't understand anything off of what you said, so Mojang will not either and they won't be able to help you.

The username is taken on java edition. The Xbox username is used on bedrock, but you can use a different one on java. You can just try adding some numbers on your username for java.

Thank you Greymagic27! I'm not home right now, so I couldn't take the screenshot.