When on top, I build up but can’t orgasm

Okay So when I’m riding a guy I grind my clit on his pubic bone, but when I feel myself getting close I can’t keep up the pace, because I get really breathless and the pleasure makes it hard to keep going. Bc of this, I’m pretty sure I never actually orgasm bc I don’t feel that release.

Is there something I can do to fix that? Am I orgasming and just don’t know it? Please comment any suggestions!!