You're not going wrong, you are just measuring yourself against all those happy, smiley people in the dementia leaflets, and wondering why you can't manage, when everyone else clearly is.
We're not.
I'm not an emotional person, but I have cried more in these last 4 years than I ever thought oossible. I am now at the point where, mostly, I try not to think about anything other than the here and now - no point in dwelling on what was and what might have been. It doesn't always work, and I have a horrible feeling that at some point I will go into complete meltdown.