Why can I only play the demo version of Minecraft?

So I was messing around with my Minecraft profiles and I wanted to remove them all because I had too many but I realised I shouldn't have done so… :/ So now, I can only play the demo. But to make matters worse, I entered in my email wrong so now I can't even migrate my account in Mojang! Yay!

Does anyone know how I can fix these problems?

Do you remember the username you used to migrate the account? If so, you can contact mojang to change the email for you. Once that's done, change your password.