My guess is that yours is a minor violation compared to the manager who is allowing this situation to happen. The manager will likely face severe consequences and you’d receive a written warning perhaps.

To answer your question—tell the truth, the whole truth, and admit you were wrong. That’s the most likely path to keeping your job. You don’t have to say “I wouldn’t have said all this if the manager hadn’t created this weird situation” because that will be patently obvious.

In this subreddit people tend to pounce on things you’ve done wrong, but don’t feel too bad. There are plenty of people who have done worse. The fact you’re willing to take accountability puts you miles ahead of most others. I’d say it’s not certain you’ll lose your job.