
I don’t know anything about you but for me I struggled with something similar where I was fine talking flirting etc, but when it got serious or physical I just couldn’t. Eventually I told myself to get over it, and once I got the ball rolling with a good partner, the rest was easier, maybe not perfect but easier.
I’m aroace and It sounds to me like you might be on the aromantic spectrum, I forget the term but there is a micro label used to describe someone who can feel attraction only to those who who don’t feel attracted to them. Obviously I don’t know your life and it does take a fair share of self reflection to map out, but it could be something to look into!