I Broke My Silence Too Soon

So, I told my lab partner that I didn't know how to do the latest experiment technique because I was genuinely unsure and wanted to learn. The next day, while discussing a different assignment, she casually mentioned how easy it is to figure out for anyone who's paying attention. I felt like an idiot for fibbing in the first place since all I really needed was to study up on it before next time. Now, every time we work together, I just feel like this tiny fraud who doesn't know enough.