Is this a symptom of ADHD?

Hi!! I’m a 17 year old girl, just got diagnosed with severe combined ADHD last November. I’ve noticed recently that I talk to myself constantly? Like I mean doing it since a kid, if it’s quiet where I’m at and I’m by myself I’m probably talking to myself. Been like that as long as I can remember. I was just wondering if that is a symptom of adhd? Thank you so much!! 😊