'confess' is a correct and usable word in written English. You can use it when you want to admit to something or reveal something that has happened. For example: "I'm sorry, I have to confess - I was the one who ate your cake.".
(I confess I felt a lot like John Waters in the 1980s, when he attended – for research purposes, and alone – a Saturday-morning screening of The Care Bears Movie during the notorious McMartin pre-school devil-worship and child-abuse trial).
I have to confess: I was suckered by the trailer for American Sniper.
I confess that some of our closely argued analysis has not stood the test of time.
8.52am: I must confess this is the first time that I've been eagerly awaiting the results of a Dutch debt auction since the eurozone crisis began.
This morning, Tony Blair's biographer wrote that Iraq is Britain's Watergate and that a day of testimony before the Chilcot inquiry gave the former prime minister a chance to do what Richard Nixon had finally, and reluctantly, done – and confess regret for the actions he had taken.
Best, Joe Dear Joe, I confess I had no idea who you were when your letter first arrived, but having looked you up, I discover that though you are a lesser Jew than me – la chose juive c'est aussi importante que la chose génitale (as Charcot would say – there might be some $$$$ in my extravagantly parenthesised bons mots reaching a wider audience).
The torture was aimed at getting him to confess he belonged to the CIA and he "confessed to stop the pain".
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.
Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com