Why can’t I orgasm???

So! I’ve been having sex with my boyfriend and let me tell you.... it’s amazing. It feels great and I’m always super turned on. BUT I never seem to cum during sex. I’ve noticed that about me.

I’ve has sex with my ex and I didn’t cum either!

It’s not a question of am I turned on enough because I am. It feels amazing. Im just really baffled with this situation. Does anyone know why? Does this happen to anyone else as well?