For quite awhile, teachers have had access to technology that identifies instances of plagiarism. Yes. you did make a big mistake. In fact, the bottom of this page has an ad for a grammar and plagiarism checker. Beyond the cheating, you attempted to lie your way out of something the teacher had clearly discovered. That certainly complicates the entire episode. You may not get a severe penalty now, but you identified yourself as untrustworthy in your actions and responses. I suspect you will be under increased scrutiny at school.
Unless you cheat again, your success or not in life does not depend on the current episode of plagiarism. Please think about what you did. You were concerned that your review would not meet your teacher’s standards. Perhaps, your own work would have been acceptable. Instead, you took a big risk and ended up with a zero. Wouldn’t it have been better and more emotionally satisfying to get an honest C rather than get a zero on the review and damaged your academic reputation with the teacher.
Cheating through plagiarism, copying answer’s off another person’s test, using another student’s homework to complete your own and all those other big and small ways are foolish ways to get around academic challenges.
In addition to stealing, cheating is just plain stupid. What makes you think that other student’s have better answers than you, you won’t be caught so cheating is acceptable if you aren’t found out, you will be held responsible at a later time for something you didn’t learn now and yet the information appears in another class or college, cheating successfully can perpetuate cheating, etc. Learning is the road to success!
Like Caesar’s wife, be above reproach!