Help !! 10 pts for the right/best answer !!!?

So I've been unofficially dating this guy for almost a year now & were only dating eachother . He's almost 19 & I'm 17 . He's more ually experienced than I am, but we've both been celibate for the last 13 months . We hang out all the time, go to dinner, hang out with friends, at eachothers houses & stuff, but we never really do anything but play fight, cuddle, kiss, talk about serious stuff & things like that . The other night he was at my house, we were drinking & smoking . After a while we were both high & tipsy, so we went to go lay down in my room & we were just cuddling, & he got hard but he didn't really try to have with me. I know he's kinda shy but I would think after a year , he would be comfortable enough. So I wanna know if he's just shy, or he doesn't want, how do I ask him ? Or what should I do ?