Can’t make me cum ?

So, my boyfriend and I love making out and so forth, and we often give each other oral and other forms of sex. For more personal reasons, it’s hard for me to have “penetrating” sex, where the Penis goes into the vagina, but that’s neither here or there.

When I give him head, it’s WILD, and he nearly/does cum every time, but with me, I just don’t ever feel like I could cum. Like it feels good I think, but when he asks if I’m almost there to finishing, I can HONESTLY go on for another 30++ minutes. He goes in pretty deep, and has done the whole “c’mere motion” with his fingers and ate me out simultaneously, practically doing what he can, but I’m just never genuinely cumming or felt the sensation of an orgasm.

I mean, I’ve masturbated, and know I can for SURE. Any tips and techniques I can pass along to my bf to get it goin? Or possibly I could just amongst the percentile of women who takes really long to cum?