It depends on your past dental history. I am the worst, the absolute worst. I have been married for eight years and have been to the dentist TWICE. Before I was married I lived in my home state and for whatever reason, I never missed an appointment, but I also loved my dentist. He was gentle, caring and I never felt anything, even undergoing periodontal surgery. When I moved I was afraid I'd never find anyone like him.... so I just never went.
I had two small cavities that were taken care of and the hygenist said if I hadn't told her how long it had been, she would never have known. I do brush, floss and use mouthwash on a regular basis.
I don't think you'll get "yelled" at. I was afraid I was going to get yelled at, too, but I guess they're happier you're in the chair than skipping the appointment. It must be common in dental offices.
Now I feel guilty - it's been two years since the last visit. I'll go if you go, lol.