You are definitely not the only person experiencing this. In case you missed it, this WaPo Op-Ed may provide some relief to feelings of isolation:
https://www.washingtonpost.com/opinions/2021/08/20/family-rift-sister-covid-vaccine-refusal/
I am not experiencing what you are, though I have had/have some much lesser strains of vaccine hesitation in my family which led me to limit visits early in my DC's life. I also have an "invisible" chronic auto-immune disease, so I know something about feeling a much higher level of anxiety around COVID than someone who "appears" as healthy as I seem.
I don't really have any advice beyond saying that this time is really hard. I personally have made decisions about what risks I'm willing to take for me and my family, and which I am not. And I refuse to debate/justify them even to my physician parents (luckily, they have been willing to agree even when they disagree). You've made your risk calculation based on what you know about your situation and the available data. It doesn't sound like you made it willy-nilly...so this post is just to tell you that it's okay.
A lot of DCUM-ers will disagree with you. Heck, it's possible I'd make different decisions in your situation. At the end of the day, none of that matters. You're doing what you believe to be right for you and your family, you're not doing anything that actively harms anyone else, and in the end that's okay.