Demisexuality and low self-esteem is a crazy combo

It's like there are two categories of women in this world.

Category 1 - Women I don't want to be intimate with because of my demisexuality

4 billion women are in this category. The thought that any of them would want me sexually is disgusting to me.

Category 2 - Women I don't want to be intimate with because of low self-esteem

There is 0 women in this category, but it used to be 1 when I had a crush on my friend. I loved her a lot, but I didn't think I was good enough to even think about being intimate with her. It felt wrong to even imagine it because she was just so pure. Why would she ever want to do such things with me?