[He's upset with himself. He shouldn't have taken advantage of the situation like that. He should have let him just go out and learn on his own. It's wrong of him to try to keep him to himself the way he does and he's only made it worse with this.]
You had no idea what you were doing, so of course you were bad at it.
no subject
You had no idea what you were doing, so of course you were bad at it.
[Except not really.]