The name of my account in java was "shadowsad6u9" even my name is here at bugs.mojang.com and when I entered the minecraft launcher it asked me to enter a new name without letting me enter and when I entered my corresponding name it said that I was in use???, anyway, I put "wavvyshadow6u9" thinking it was for a java profile name or something similar. Now my account is called that and I can't enter the servers with my stadistics, let alone go back to my old nickname

 
I've been playing the game for years and nothing like this has ever happened to me, I need answers.