All I can say is you've probably avoided a lot of frustration by not feeling angry. Of course it's okay not to feel mad. Everyone's reaction is different and your feelings towards those who wronged you are your own. You're a very strong person if you've managed not to be angry at them and not let yourself be clouded by hatred and rage. I wish I could be more like you that way because I hate those who wronged me with a passion and I don't want to forgive them. So no, it's absolutely normal and a lot of people don't go through the anger stage.