I fucking feel you man.
You just have to accept that all women get railed and have random hookups, simply, they are just as horny as you and me, and they can get it so they do.
Casual sex and multiple sexual partners is the norm.
People settle down pretty late in their lives, for most people their last/permanent relationship both are going to have a decent tally. Average depends on country but in the West you can expect that to be between 6-12 sexual partners in a lifetime based in muktiple statistics.
I know how devastated you are, I've been going through the act same thing in he last couple of weeks, it's brutal
I understand your desire to be special, unique and meaningful to a woman. But it's just not realistic that you'll be someone's first, and if you're then most likely you won't end up together.
The norm is that you spend the rest of your life with a "used up roastie" it 's not even because of inceldom, that's seriously the norm.