I'm demisexual, and everyone I ever been attracted to were people I knew very well. It's a bit complicated, because my friend circle and my dating pool becomes the same thing. On your case, maybe "friends to lovers" is something that's okay for you, but not to the men you've taken interest? Maybe you give "close friends vibes" in the beginning of the relationship, and then you end up in the friendzone - hence the men not taking interest into you.