How do you determine if you have attention deficit disorder?

My mom has always joked that she has ADD because she can never stay on topic and will even stop in the middle of a sentence and not finishing it, and will suddenly forget what she was talking about and start talking about something else. I can never sit still in class and I’m really fidgety. If I write anything or have long conversations I get really off topic and i’m constantly told by my friends that I’m soooo random and i can’t help it. my brother also thinks i have add. do i?

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