minecraft showed me I have not bought it at all

yesterday I came home to turn on the pc and play minecraft but when I turned on the launcher I was logged out and when I logged back in the upper corner instead of my nick (yeti107OwO) was (player) instead of playing was a button play beta I don't know what should i do minecraft i bought from approximately spring this year. even though I was on minecraft.net so it showed me that I have not bought it at all