It will get easier
We have really relaxed rules around here and our puppies I've found are calming down a little already. I read about all the stress and training and classes and stuff that goes on and I guess I just don't get it. We don't try that hard with any kind of training and it doesn't seem like ours have any more accidents than anyone elses, and we certainly don't stress over it. We just know they will eventually get it (the pups). Maybe you should just lighten up a bit on yourself and try spending more time just enjoying him
He'll eventually get it