Not only is he packing a bigger dick than you, he is also a lot more experienced where it matters. You are the one who needs to grow up, not him.
Maybe you want to ask him how it feels like, to fuck a girl. Guys like to brag about their sexlife.
Maybe he will laugh at you, or call you a bitch. But he can understand. He knows your are
just jealous.
Just remember this one word.
RESPECT