I am unable to login to my main account. This is pretty bad because that's the only account on my computer that I know the password to. I'm posting this as root. The user doesn't show up on the login screen or in the switch-user menu. You may think this is a duplicate, but I'm not supposed to delete/make a user. So this doesn't apply. This Mac also has a firmware password that I don't know, so I can't use Recovery Mode. Any help would be immensely appreciated.
I'm using macOS Sierra 10.12.1.
EDIT: I should note I can
su to my account.