As teachers, we all plan a lesson for the best of times but we do notice that the lesson does not work as best as we expect. Don't give up though. I would recommend that you go back to the lesson again, reflect on what needs changing, how best to amend the lesson and/or the material and try it out again with a different class or with some other students. If you continue to try this out, you will soon start to notice that you teaching and your lessons will improve as you will soon realise what is best suited to your class. If you don't change, you will get stuck.
So what are you waiting for? Try this out and think about your lesson at the end of it.