I think it's very hard to believe in the Eucharist unless you learn to believe when you're very young. You have to try believing when you're still young enough to really believe in things like ghosts and magic. If you try to believe that Jesus is really and truly present in the sacrament when you are still young enough to really believe, he comes and then you believe forever. But if nobody prepares you right for your first communion, sometimes you never learn to believe enough to make it real for you.