Orgasms with Boyfriend

Hey girls! Soooo for some reason that I’ve never been able to figure out I seem to never be able to have an Orgasm while having sex with someone else. And I’m young too only 20 yrs 😩 I’ve had them before but only in private when I was masturbating purely using clit stimulation. I’ve never really had a problem knowing this until I got in a relationship and now my bf always seems to question why I can reach a climax claiming that every other girl he’s had sex with has been able to easily. I don’t necessarily feel bad about it yet but I know I will one day bc im missing out on an experience that I of course want to share with the man I love! So anyway that’s my little back story and I was just wondering if there’s anyone out there who deals with the same issues and possibly has advice on what I could do to help fix this?? Thanks!