He thinks I'm lying

So I had sex for the first time EVER with my current bf. It was amazing, only hurt a little and he always makes sure I enjoy as much as I can. It's all great, but one thing kinda bothers me. He continues to ask if I was really a virgin when we met because in his words "you're too good". I know it should be a compliment but it kinda bothers me because I have no idea what he means. He says he trusts me and it doesn't matter if I was really a virgin or not. But he's convinced that I've had practice. And I'm just sitting here like "your dick is the first and only dick I've encountered, okay. Thanks."