The conclusion you came to, after realising a girl you like was interested in you, but you just couldn't see it no matter how many hints she thrown at you!
I never realised that she was into me! I'm a fucking idiot.
Don't worry, you're not the only one.
"I'm an idiot."
used when you just fucking hate yourself
Guy 1: "Have you seen my hat?"
Guy 2: "It's on your head..."
Guy 1: "I'm an idiot"