Is anyone here diagnosed without family history

I got diagnosed recently and I am doubting my diagnosis. Although I passed all the adhd assessments and loads of things in my past and present made sense after the diagnosis. I don't have it severe, I learned how to manage it and assess it in many ways. And the one thing that made me doubt it the most is my family history. I don't think anyone in my family got it. Or they mask it so well, I have no idea which I doubt. Surprisingly in my assessment no one asked me about my family history. The only thing they asked if there is a history of addictions etc. So the question is: Is there anyone who has a similar situation? (dog here to draw your attention, isn't she adorbs)