How do I say I’ve changed my mind after the work dinner?

I said it was okay at the work dinner, but on the way home, I felt differently. Saying yes once doesn’t mean you have to keep saying yes.

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I said it was okay, but changed my mind on the way home — I said it was okay at the work dinner. But on the way home, I realized I didn’t want to leave it at that.
I only felt uneasy after I answered — In the taxi on the way home, a message popped up asking me to confirm our plans. That’s when I realized my “it’s okay” didn’t match how I felt now.
You don’t have to be bound by saying yes — Saying yes once doesn’t mean you have to keep saying yes. If your feelings change, you can say so and check in again.
Tonight, write down how you feel now — Tonight, write how you feel now in one sentence: “I said it was okay earlier, but I feel differently now.”
You can speak up again after your feelings change — Saying yes earlier doesn’t speak for how you feel now. From the moment you notice your feelings have changed, you can check in again.