So embarrassing !

So me and my bf were getting it on.😉 and I started sucking his dick and he always tells me to swallow ( I never have ) so I decided to do it and when I was sucking his dick went to the back of my throat and he cummed and I tryed swallowing but I gagged sooooooooo bad that he started laughing! I was super embarrassed! 🤕 I want to give him the pleasure but it's so hard for me to swallow.😩 any tips?