Giving my boyfriend head

Okay so I'm 15 and my boyfriend is 16. We've been together for six months and we recently started having oral sex. He LOVES eating me out. He constantly wants to. And of course I love it. When it comes to giving him head, I love pleasuring him but I can't stand the taste of his precum. It's so salty and he's the kind of guy that has a lot of precum. That's the only part that I really hate but it makes me gag and I feel bad stopping. What can I do??