Technically, shadowing and volunteering are not required for most dental schools - it is only recommended. If you feel you've done enough shadowing or volunteering, then you're the only person that can determine this. Personally, I still volunteer and shadow because I continue to learn new things through them.
Anyway, you've determined that shadowing is boring, which isn't to be confused with losing interest in dentistry (I assume). I understand the perspective that you probably want a more hands-on experience rather than observational experience. Maybe a job as a dental assistant in the future? In my opinion, I think you should take a break from shadowing for now...
Good luck with everything!