Ate oats over Passover and now I feel bad

So oats are very much not kosher for Passover, but I didn’t realize the thing I ordered for lunch had oats in it until it was too late. I’m in university and I decided to go to a smoothie place on campus for lunch and get an acai bowl, thinking “oh it’s basically a smoothie with a ton of fruit on top, that’s good for Passover!” and then I got the bowl and it had oats mixed in. The bowl was $12 and I didn’t really want to spend any more money on lunch when I’d already bought one, so I sucked it up and ate it even knowing it wasn’t kosher for Passover.

I rationalized it with “I don’t really keep kosher anyways, it’s fine”, but I sort-of keep kosher in that I separate food into the categories “kosher enough” and “totally not kosher” and this meal was definitely in the latter for this week, so now I feel absolutely horrible. I felt horrible while eating it too, I think this is the first time in my life I ever knowingly eaten chametz over Passover, and I’m definitely not going to eat any for the rest of Passover, but I legit want to cry over this I feel so bad. Idrk why I’m posting this here, I think I just wanted to vent and feel too bad about it to tell my family. But it’d also be nice if someone could give me spiritual advice on this maybe, or just anything to make me feel even a little better?