You are by no means stupid. Hey, everybody slips up once in awhile. If they didn't, they wouldn't need forums like this

You can't change what you ate, so don't beat yourself up over it. Just strive to do better in the future. After all, from your stats, you've come too far to give up on yourself now.

And if all you need a a good kick in the butt, that's what we're here for