how do I control this??

Im 18 and im friends with a guy that,s 16. I know your thinking how we meet. I met him at a Christian Retreat. From then on we,ve been hanging out and yes flirting. Believe it or not he pressured me too have a relatioship. I felt that it was too soon. But I said yes. We,ve been going out for 2 weeks. Short huh?? I guess I found out tat he,s a better friend than a boyfriend. And now that we see each other at bible study on tuesdays, I can,t stop thinking about him. I get jealous when ever he,s w/ his friends b.c. He,s having a good time with them...and not me! And when,s he,s w/ a girl I get jelous, I guess this is the guilt that I have of my self.