Well...I don't know if two guys sleeping in the same bed, at your age, is more common where you are from or not. But I would guess that he might be as scared as you, even more so, and maybe he needs you to make the first move, even if he resists a little.
He may need you to be a little aggressive, with him, to get him past his initial panic, if he does panic. People get being straight ingrained into their minds, even though they are not straight, that first encounter might be a hard wall for him to jump over. You might not only have to start it, but keep it going for a while too. If you get him going, don't expect anything back, you know the first time.
Well....good luck.