That's quite true but if you did read OP comments associated with the third emotion listed above you would understand that he meant the bad aspect of confidence tagged over confidence and not the good kind. Not forgetting the popular saying, "too much of everything is bad and what does have a good side also has its bad side". Over confidence is a silent killer and can cost you, your capital when investing if not handled properly, so OP is right in highlighting it as an emotion to put under control although what he should have written is over confidence and not just confidence, as those who just skimmed through OPs before replying might cause them to misinterpret the intended message
But there's a catch (more like catch-22 really)
As the saying goes, it is easy to be wise after the event, and while you can easily determine when you feel fear or greed (or any other emotion, for that matter), then at least try to do something about it, it is impossible with overconfidence (and that also explains why it is not an emotion at all)
Really, how do you know in advance whether you are in fact overconfident or just being rightfully confident? You can only judge yourself after being proved wrong in your attitude. Otherwise, you have all the reasons to say that you were just confident what the market confirmed and validated