I don't think you should worry. A certain young lady of my acquaintance had her very first orgasm at 22 - with her thighs wrapped around my ears. About 6 months later we were married (to each other!) and exchanged virginities on our wedding night. It took a couple months of deliberate practice and learning together before she regularly had orgasms from intercourse. Over 30 years later, she'd probably tell you that her most intense orgasms still come from oral sex, but the most fulfilling happen when I'm inside her.