Ladies help!!!

Me and my boyfriend have had sex 3 times. He's never came and it bugs me!! Like the last time he hadprecum before we had sex from me, I know he enjoyed it but I wish I could make him cum. I even "finished him off" but he stopped me to go "pee". I think he got embarrassed and didn't want to cum in my mouth but he was gone for a few minutes lol. It makes me feel like I'm doing something wrong