Username was replaced with something else

Hello I've got a problem with my gamertag/username in MC Bedrock. I dont know how but I logged onto MC and my username wasn't the one I have, it was the id/name of the skin i downloaded, which is very long, just today and I don't know how to remove it or get my actual username back. My user is kindalisaig and i've already tried finding out the problem but there was nothing I could find.