I need some advice

So there was one day me and my boyfriend had been drinking nothing to heavy just enough to get kinda buzzed. We both get really horny when we drink and we were fooling around and I gave him a blow job. I have never had any other guys complain about it and they all tell me how much they enjoyed it. I’m a very self conscious person and afterwards we were watching a movie and we were both still buzzed he told me that the blow job was kinda scary because I kept hitting my teeth. I didn’t think I was but he would know. And ever since then I’m to nervous/self conscious to give him another one because I don’t want him to “complain” again. He keeps hinting about me giving him another one you know practice makes perfect. But I just avoid it. I want to pleasure him and make him feel good like he does to me but I can’t get past my self consciousness. Any advice or tips?