Cowgirl and clitoral stimulation?

I don't feel clitoral stimulation from his pelvic region/bone when I'm on top. Everybody says I will, but my clitoris is not in the direction of his pelvic bone when I'm sitting on top. What am I doing wrong? When I lean forward, I still can't get my clitoris to meet with his body!! We are both thin, he is muscular but has very little body fat, could this be the reason? I'm so confused and frustrated because I'm struggling to orgasm