You Aren't Fooling Anyone (really)

You are bad at what you do. And eventually they will figure it out. Maybe not now, but soon. And you could try to change, but why bother? You may be further along than you thought and no way you can change with so little time. And don't discount the possibility that you are too dumb to do anything about it and it is that ignorance which may also be the root of your crappy performance. Or maybe laziness is the issue, and you would need motivation to change that. See: the laziness issue as to why that ain't happening. You've coasted as long as you could have hoped for. Longer than we all thought possible. Really, ironically, that's something of an accomplishment.