Welcome to The World of Fools. I've been there before. And while I would like to think I'll never be there again, the reality is, I'll be back.
I was in a very similar situation such as yours. I too made that call I shouldn't have.
But at least I can say this: All doubt is now erased. It's over and now time to move on without looking back.
There's something about the definitness that is very comforting, knowing you gave it your best shot. The price we had to pay to get that knowledge was feeling stupid, but in time, one recognizes that it was probably worth it.
Anything is better than forever thinking: "If only I..."