So basically I went somewhere for about a day and came back log on to my computer and try to play minecraft using badlion client which is the launcher I use. It didn't work so I said ok well let me try again didn't work. So then I went to the normal launcher and it loaded but said play demo world. I looked it up and that means I don't own it but I have for years probably since at least 2014. So I download minecraft again because I thought it might be buggy. It still didn't work and here we are now.