I've been playing Minecraft under the username "Canwm"for a long time now. But now Minecraft.net and the Java Minecraft launcher says that I don't own Minecraft. I brought it in 2015 and since then moved it to a new computer with no problems. Now that i'm moving computers again it just says that I don't own the game. I tried buying the game again but I'll have to get a new user name and loose all the things I did on servers and in my worlds. Is there any way for me to get my account back without loosing my progress in regards to worlds and servers?