Coming out to my grand ma advice?

My grand ma is an odd case since I know she won't care much since she already went through the stages of grief with one grand son who is bi, but I'm so nervous of coming out to her. I've tried subtle hints and even less subtle ones of "I've had a crush on a guy before." and yet she still asks why I hang around gay people. A few weeks ago I joined a local gay church in the evening, and she doesn't know why I went. I wanted to meet new people, and see if sexuality and faith really mattered to each other, where the answer is meh.

I just don't know how to make her see that who I like doesn't matter, or how to discuss it in the first place. She's so hostile and lack of understanding. She is a very learned person who doesn't want to learn. To her sexuality and gender are very binary whihc is why this is so hard since part of me expects more from her as a person. She says often her and I are alike, but we are alike as two second born children of the same family, beyond that, after you go far enough we branch in very different ways.

I want her understand, yes I like men, yes it is who I am, it is not family issues, not parental abandonment or anything like that. I want her to see me, and I want to help her through the process of the stages of grief she'll most likely feel.

Last part, I'm the "Straight-Gay" type of person, who basically doesn't act like a sexuality so everyone thinks straight. Which has been why bringing up sexuality has been hard. Though I've never hidden my gay rights atavistic nature, I've denied my sexuality to her for yeas, and I'm done lying.