How bad is this?

[dirty_dan]

End of a card dead online 2-4 session. I recently got my first playable hand in about an hour: KK in the big blind and it's folded around to me.

So now I open raise in LMP with AQo. CO and BB call.
Flop is 632 rainbow. BB checks, I bet, CO folds, BB checkraises.

I folded...

Comments, criticisms and insults welcome.