I agree with you, but I also agree with the original sentiment.
I think the difference is, he is talking about, in the past, forcing the external circumstances of his life to conform to some ideal, where as now, he accepts that this isn't possible.
You, on the other hand, are talking about fighting your own internal battle to make yourself the best you can be. Your battle does sound exceptionally difficult, but we all fight that one.
I think maybe the point that I take away from all of this is, you can't always change the world. But (with a lot of hard work) you can change how you react to it. And that's the more important battle than any external circumstance anyway.