Hi Monicott, I understand what that's like. I hadn't been to a dentist in about 20 years until last May when a wisdom tooth root abscess forced me to finally make an emergency appointment. I did what you're doing and looked up reviews of all the dentists in the area. When I went in, I just told them all (the x-ray tech, dental assistant, and dentist) that I had severe anxiety. They went out of their way to try and make me comfortable being there and the assistant even brought me some water while I was waiting for the dentist. The dentist told me that teeth are their job and they've seen it all, so there's no need to feel ashamed or think that you might have the worst teeth they've ever seen. I was very, very surprised because I had terrible experiences at other places in the past. Not every dental office will be like that, but I really believe that things have changed so much over the last 20 years. Sedation dentistry is also offered by many places specifically for people like us who have severe dental anxiety or are too embarrassed. Even if you don't choose to use it, I would recommend going to a place that offers sedation since it'll mean that they're aware of anxiety in their patients.
Also there's a good chance your teeth aren't as bad as you think. I honestly thought they would recommend I get all my teeth pulled, but that wasn't the case. Once they get an x-ray, which they do right away, they'll see how much bone loss there is and what your options are. Also there's all kinds of cosmetic things they can do and whitening so that at least you'll be able to smile again, if that's an issue you're having.
Good luck to you. It'll be ok. (Sorry, this is a really long reply lol)