I'm in a similar position to you weirdly! I want to straighten out my top teeth (one is too far forward) and close gaps at the bottom.
The orthodontist shocked the hell out of me by saying jaw surgery, extractions, train tracks, if I want the overbite fixed.
I hadn't even thought about the overbite, I've always had it, it never bothers me.
Now he's worried that my expectations of Invisalign are too high (it won't correct the overbite and might make it worse) so he's doing the initial scan without me paying, because he wants me to see where my teeth will end up before committing. He said it might make it worse because my top teeth will move out a bit to get them straight due to lack of space, and my bottoms will move back a bit as they close the gaps.
So now I've started being self conscious of my overbite which I never was before (they call it overjet - my lower jaw is further back than my top jaw).
For me, I don't think I'm genuinely worried about the overbite, it's really just the bottom gaps and the top overcrowding which is making one fo the middle teeth move forwards on its own and I have visions of a witchy crone tooth in my future (I'm 46 and it's moved over the last 15 years or so). So I'm still thinking of Invisalign. No way would I have extractions and certainly not jaw surgery !!!!!! I was shocked !
I'll see what happens on Monday when I see the orthodontist again....