As far as I know I don't have ADD, I'm able to focus if I want. When I get working on a painting, a story, or an essay that I'm interested in I can forget to eat or sleep. Sometimes I'll spend 5 hours straight working in the studio and be confused as to why I'm so sore, forgetting I have been standing for 5 hours. And my friends frequently comment on how laid-back and easy going I am.
My mom is an ESTJ, she almost perfectly fits the description, my brother is an ISTP, and my dad is an ISFP. I'm definitely the odd one out in my family. I always have been.
And although I don't think I have ADD, I'm recently struggling with moderate depression and recovering from mild OCD relating to the struggles of being a closeted lesbian and coming out. So I might be a bit more cynical than usual. (These are just my suspicions based on research, I have yet to go to my university's counseling center, although I will likely make an appointment sometime soon.)