Minecraft Demo

Today I tried to access my Minecraft account but I forgot the password so I changed it and when I logged back in it was in demo mode even though it wasn’t the last time I played it, because I bought it.

One of the possible reasons for this happening is that I’m not using the email I used when I bought the game, I just changed it a long time ago when I tried to change it back to the original email it said it was denied.

So it looks like something is wrong with accounts and it’s forcing my Minecraft in demo mode. Did anyone experienced that? Is there a fix?