He's not okay with his powers, they are letting him down for unknown reasons which has lead him to question who he is yet again.
What is "force" in this context? Discovery. Once Lana discovered the secret there was no possbility of hiding anymore. It's significant that he did not open up to Lana of his own volition because that is a habit he has maintained throughout the course of his life. Wonder Woman is an extraordinary case. Unlike Lana she doesn't "benefit" from information about his alien heritage, that was her starting point, she "benefits" from knowing about his human background because that's the aspect of his life she is farthest removed from.