Please help! Renamed home directory

[Ellie]

I've done something incredibly stupid and now I'm afraid I've lost everything.

I wanted to update my username on my Mac, so I did that in System Preferences > Users & Groups > right click Advanced Settings. I stupidly updated the name of the home directory to match.

Now when I try to use my computer, I keep getting pop ups wanting keychain passwords and one that won't accept my password that says: 'OS X needs to repair your library to run applications. Type your password to allow this.' But it doesn't accept my password.

Scold me all you want. I know I've done wrong. But can you please help me get back on the right track?

 

[honestone]

First of all, what exact Mac model are you using?

Secondly, what OS are you using?

Third, have you been making any kind of backups to an external device?

All of that will be useful information for us to help you.