I am surprised that this is not a word - I thought this was a real word. Turns out it was just my hop

I thought this was a real word. Turns out it was just my hopes being crushed.

I believed this was a real word. Turns out it was just me being dumb.

I thought this was a real word. Then I realized I was wrong.

I thought this was a real word. I was wrong. I was very wrong.