I cant log in on the Launcher

Basically, When i open the minecraft launcher It sais to enter ur email, username and when i do that it is just forever loading.
Ive tried other passwords and emails but they all just say incorrect.
It should load me in to the minecraft launcher but its always just loading.
I also tried another account and that did the same thing
I tried redownloading the launcher but it still just continuously loads
Plz Help

Also it sais launcher 1.6.66 which isnt an option so i put the only option there was