Parents divorcing

How do you think a 16 year old should react to parents getting divorced? The night before yesterday my parents told me and my 2 older brothers that I live with that they have decided to get divorced. Anyway, since then I have been feeling sad and upset and emotional. Ive been crying a lot, I cried when they told us and I have cried in front of all of my brothers a lot. And I am just so thankful for my brothers, I could not get through this without them. Is it normal for me to be this sad? And when is it normal for me to stop being sad?