You have gotten sounds advice throughout and I would agree that the teacher is giving you a chance to come forward. You should take advantage of that opportunity.
What does raise concern is that you apparently either didn’t read the questions asked or are so overwhelmed with the subject matter that you didn’t realize how far off your answers were. Either way I would be introspective. Cheating is a shortcut that is ultimately self destructive, but not even reading the question is just sheer (pardon the directness) lazy. I suspect that may be a result of feeling overwhelmed.
Please don’t put so much pressure on your self or take on so much work that you need to resort to such behaviors.