English phrase from drama scenes

What Does "i don't know what i was thinking" Mean?

Learn what "i don't know what i was thinking" means, when people say it, and how to use it naturally in English.

Beginner
Neutral
Soft
Express Doubt

I don't know what I was thinking.

This means the speaker regrets a past action and cannot justify it now.

From Twist Of Time, Episode 16

When do people say this?

Scene Context

Someone looks back at a past choice and cannot explain why they did it.

Usage Scenario

Use this to admit a bad decision or an embarrassing mistake. It is common in apologies and reflective conversations.

Better ways to say it

1
I don't know what I was thinking.
2
What was I thinking?
3
I don't know why I did that.

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