I Might Be the Asshole at Work?

So here's my situation: I work in a small office where everyone knows each other. It's kind of like high school, but for adults who drink coffee instead of soda. Anyway, one of my colleagues, let's call her Lisa, started bringing this really expensive, fancy coffee to work every morning. It was the type with names and flavors no one could pronounce. She would always talk about how great it tasted and sometimes even offer a taste to others in our office. I have to admit, I got kind of jealous. Not just about her liking something better than me, I actually had this weird feeling that everyone else might think she's cooler because of this fancy coffee thing. And then one day, after Lisa had left for the weekend with her bag full of unopened coffee pods, I couldn't resist. I took a peek inside and found an unopened box of those expensive beans. Yes, I did it, I actually tried to open them but didn't succeed. Now here's where it gets worse: even though I felt terrible about what I did, the next day when Lisa came back and was looking through her bag for her coffee, she noticed the box had been messed with. She got this look on her face like she knew something wasn't right, but thankfully didn't say anything. But here's the thing: I feel really bad about it. It wasn't just a casual office joke or a one-off prank; it was me feeling insecure and acting out of character in a way that could damage trust with my colleagues. So now I'm wondering if this is normal behavior? Am I overthinking this, or do I need to come clean? What would you all do in this situation?