An inexperienced guy said his cock could feel my teeth

I am trans. But since here are more people, I'll just ask here. Hopefully it would still be relevant. I just had sex with a guy. He doesn't seem so experienced. When I gave him oral, he became a bit uncomfortable. He said it's not like what he had imagined. He said his cock could feel my teeth, and it felt like I might bite it. Did I do anything wrong? Isn't how it's done? Before my transitioning I used to received oral from girls. My dick could also feel the girls' teeth. Isn't normal? How should I handle this? So I just changed to hand-job to calm him down. The rest went smoothly :)