Bless your heart. Why would anyone call you stupid or selfish? I’m sorry you are having such a tough time and don’t feel good enough. Compared to what? Society’s rather rigid standards of success? It’s not easy being MI. You are being way too hard on yourself. It sounds like you hold a lot of should statements firmly and that will make you miserable.
I don’t have any advice. I just wanted to reach out and offer support and big hugs.