Don’t know what i want sexually

My bf keeps telling me he wants me to tell him what I want cuz it’s a huge turn on for him. honestly, I don’t even know. i’ve tried doing it myself and nothing happens. I think im broken. it doesn’t feel like anything. like no matter how much I try. i’ve tried so long and it won’t work. I feel like he’s gonna leave me for someone who does know what she wants. /: ughhh. help. rubbing my clit just doesn’t feel good for me?? it’s weird.