Having friends, you can be honest with makes life so much richer. That doesn't mean that if you’re not doing well that it's OK to be a Debbie downer, no, we are all still responsible for our own happiness.
Being positive is a choice, some days it is not an easy one. But what I have learned is that I can be in control, I can choose, and so can you.
Don't let goals get in your way of finding joy, just because you have dementia.