Massacrre, I need you to update your GamerTag and your Username.
GamerTag - Click "About Me" on your profile (directly above), then click the yellow pencil next to "GamerTag", update it, then "Save".
Username - Click "Help Desk" on the top right corner, click "Request Login Name Change", type in your name EXACTLY as it is spelled, then send/submit the request.
Thank you.