Hi Danielle, 03 September 2018
This is a "Suitor" post; no bears or guns allowed.
I'm assuming, due to your small town environment, that each of your suitors knows about the others. So now the dilemma is: "How do you announce your choice," (not including on Susan's) to the ones not chosen without alienating anyone? I would think by now you know who you want to spend the rest of your life with and I'm sure you have vetted each of them very carefully, so you should be able to make a wise and loving choice.
Not being a counselor I don't know the correct way of telling the ones not chosen of your decision. I do think if you tell them you like them a lot, have enjoyed being with them, thank them for the wonderful times you spent with them and then tell them that you have fallen in love with someone else. That's not the exact wording, just some ideas you might want to use. The bottom line is, Yes there are going to be hurt feelings; no one likes to be rejected.
My take on this is your Dental Hygienist is the one you care for the most. If she proposes to you, and you accept, "dilemma drastically reduced;" announcing your engagement to each of your suitors individually will ease the situation, especially since they didn't propose (unless they have and we aren't aware of it).
I don't envy you for what you have to do, but it will need to be done sooner if not later.
Best to you young lady, you have your work cut out for yourself. You also have an indispensable trait, you are a very nice and caring lady.
Best Always, Love
Chris