I can't log into my account

So on november 9 if i remember right i created my first aternos server for my friend and me to play on it. The IP is pb12YEUm.aternos.me:30416 if i remember right my username was Ruben0 or something like that. i never loged in because it was bookmarked for me so i never had to log in. But yesterday i wanted to play and i clicked the bookmark and it was logged out. When i typed in the informations it says Please click on the Facebook icon below to log in. I don't even have a facebook account But when i try to log in with google (i tried all the emails in my computer) it takes me to the create a new account panel and when i type in my username Ruben0 it says it's an already existing username so i don't know what's the problem