I never worked in a dental office or what's so ever.
You just need these things:
Good DAT
Good GPA
100-200 hours volunteering( I have hours in muesums, or dog shelters, and some at hospitals and red-cross, none is dental related!)
100-200 hours shadowing dentists ( mostly general dentists, but some other specilities are encourged too)
I joined 2 clubs 1 at school and 1 meet up groups ( fun groups, I was just a member, nothing related to dentistry! that was my extra curricular activites.)
I tutored science courses for some time and this was the only work experience I had.
Your gpa is good.
So If I were you, I would look for a dentist to shadow this summer and also a place to volunteer
at the same time I would prepare to do very well for the DAT.
and when senior year starts, join 2 clubs at your schools
FYI: most of my volunteering/shadowing occurred in my senior year and some at my junior year. and some even in my gap year.
You will be fine, it's ok to identify the problem, but it's not ok to be passive and do nothing about it. Being lost and confused over this is not worth it, what's worth it is to act fast and improve your application.
Start looking for volunteering and shadowing opportunities ASAP.
One last thing, do whatever you can but don't destroy your GPA just so you have extra curricular activities, just please don't do that.
Always shadow/volunteer in your free time, not during your studying time.