I'm another one with one AC that I have to keep my opinions entirely to myself, because I hate being shouted at, I can't cope with it. Don't put yourself down, you have actively made that choice not to confront, so that is you in control.
I do fear that perhaps your husband has destroyed your confidence over the years. What you need are people telling you that you are lovely, you have a loving, caring personality and they value you. We can do that on GN, but we don't know you personally, you need support locally.
I am glad you get out on your own, do join a class of something you are interested in, and U3A is also good. Perhaps visit your local church, synagogue, temple or mosque, depending on your faith. Don't worry about voicing opinions, just ask people to talk about themselves and their interests, they will love it. Just try not to glaze over when they are discussing how amazingly gifted all their grandchildren are!
If you can find the strength to believe in yourself, others will too. It's not easy, do try counselling as well as the antidepressants, which can make you feel a bit of a zombie anyway. Good luck, and keep us posted on progress!