I've never had the ability to feel sexual pleasure, unfortunately. Was a confusing time growing up. It also sometimes makes me really feel like I'm missing out. When all media revolves around sex and you can't even feel pleasure from masturbation, it feels like you're missing something from the core human experience. Sometimes it has made me feel like a different species.
I guess at least for me, I "don't know what I'm missing" because I've never experienced it. I'm sorry that you know what it feels like so that it's more painful when you can't anymore.
Has anything changed in your life recently?