Your parents may find it a shock to begin with, there is no way of knowing how they will react. I doubt they will hate you though, yes they may take a while to come to terms with it, but you are their child, their own flesh and blood. If they have no idea about it, then it may take some time to get use to, but don't take this personally. Most parents are shocked when their child comes out to them, it is only natural. I know it is hard, but try to act as naturally as possible, that way the more confident you sound, the more likely they are to realise that you are happy and that there is nothing for them to worry about.