Good days are okay too

What I find hard to swallow is that when I have a good day, my mental health is questioned. 
It's something the government do and I joke about them being like "forget the 364 bad days, you have a good day? You must be fine."
I don't expect it from people close to me. It seems like perhaps I choose to do the good things but it's because I don't tell people the days I cancelled or rescheduled things. I give focus on the positive days because it gives me less guilt to talk about those. It's not selective to struggle some days and manage others. I'd love to have someone hold my hand but somedays I force myself out of my comfort zone because I'm an adult and sometimes you've just got to. You have to just remind yourself that people aren't always reliable and you can't always wait for someone to help you out. Sometimes that means putting on my big girl pants and others that means it waits another day.
Both of these are valid and should not be seen as me choosing to be well or unwell. 
I have cancelled many nice things to lay in bed and went to meetings I've dreaded. I've also cancelled things I've dreaded and done nice things; it's all what I feel I can manage at the time.
I wish people could be more understanding and look a little closer so they could see that. It would make my life a little more bearable, and make my good days far more positive.