Absolutely. I had similar feelings when I got in and even at times while in school. I was happy but I felt like I worked so hard in undergrad to achieve this goal and it was like "Now what?".
Sometimes I felt like I didn't enjoy Dentistry but later I realized it was just that I didn't enjoy the waves of stress that can come with dental school (you'll be very busy!). Just like anything else, Dentistry and dental school will have ups and downs. There will be classes you absolutely love and classes you hate and things in between; things you're good at and things you're not so good at (but can improve on with practice!).
Even if there are some things you don't enjoy, you'll see that the good will outweigh the bad if Dentistry is what you really want to do. At the end of all this, you'll be a dentist. Remember why you wanted this in the first place and what motivated you. It's exciting and can be a little scary. Learn as much as you can in school and take it all in
I teach third years on occasion. You guys have literally just started interacting with patients in a way that goes beyond hygiene/cleanings. It's completely normal for this to feel foreign, awkward, nerve-wracking, anxiety-inducing, the-walls-are-closing-on-me-please-end-this-now. And in a school environment, it can be really strange since you feel like there are multiple people breathing down your neck. It's for this reason I really try to take a different approach most instructors do with students; I'm there to help you guys learn, to make the situation enjoyable and fun and as casual as possible, not berate or put you down for doing something I wouldn't do or differently than I think you should. It's completely unreasonable for me to expect you to know exactly what to do, how to do it, when to do it, and then execute it to my standards. The truth is, when you walk out of clinic, you shouldn't be pondering "Did I do good? Did I do that well?" you should be thinking, "Did I learn something today? Yes. Okay. Good. Onto the next."
I know it's hard not to get tunnel vision with what you're doing, but try to take a step back and realize that you're there to learn. You are indeed, there to make mistakes. I know that sounds catastrophically wrong, but it's the truth. It is a school, first and foremost, not a dental clinic. The patients receiving care bit is sort of just a necessary consequence. I assure you that, in the end, although it's a long road, it all evens out, and your learning continues heavily into private practice.
I'm 3 years into private practice and only now can I say that I feel pretty confident with 90-95% of the situations I encounter on a daily basis in general practice. I still refer things out, and even with some bread-and-butter things I still run into trouble, because it's the nature of it. But I approach situations like this differently. I used to approach it with the occasional "I'm not sure what the fuck is going on here" mentality and allow fear or anxiety to take hold. Now I approach it with the mindset of "I'm just here to do my best and take good care of my patient and maybe learn somethign along the way" and I allow that to take me wherever it may. It has allowed me to become a better dentist, both clinically and non-clinically.
You're not just a student of dentistry, you're a student of life. Treat it that way and you'll feel less anxious about your situation. Zoom out a little bit. It'll be fine.
You can find the bulletin here: http://umanitoba.ca/admissions/media/dentistry_bulletin.pdf. It lists the minimum DAT score and core course GPA needed for an interview invite. It changes a bit every few years.
Interview invites are based on core course GPA and DAT score (regular applicants). AGPA is looked at only for the final decision. On average I would say accepted applicants usually have an AGPA of about 4.00 or higher.
Hope that helps. Good luck!