Why is it difficult 🤧🤦🏾‍♀️

You guys I need some help, so recently I went on a vacation with this guy I really like and we had sex. I was really looking forward to it but when we had sex I just couldn’t orgasm, and he was trying so hard to make me orgasm but it just wasn’t happening. So then I started to feel bad but he told me it’s okay he understands and blah blah blah. So Ive slept with 8 in total and I’ve only orgasmed 2 separate times and it wasn’t right away. With my vibrator though it’s no problem I come n like 1-2 minutes, I’m just annoyed with the fact it’s hard for me to orgasm with a partner.