Why can’t i orgasm during sex?

So I’ve been with my boyfriend for 9 months and i told him i used to fake it with my previous one because sex wasn’t good. Not specifically saying i don’t fake it with him, he thinks he makes me orgasms during actually sex all the time

. That was months ago and now i just feel terrible telling him i can’t orgasm during sex. Is there something wrong with me? I want to know what it feels like but lately sex seems like it’s awesome for him and not so much for me. I just ask him to go down on me so i can at least try to cum.