How do I get my mom to understand that I deal with my adoption issues in a different way?

So, my mom always wants to talk about everything that happened and cry about it, etc, but I don't and she gets upset about it. I'm 'dealing' with it right now by focusing on any legalities that need to be taken care of and work, etc and pushing it to the back of my mind, because thinking about it makes me crazy. My mom always brings it up though and she wants to know all my thoughts, feelings, etc and I really don't want to talk about them. What's a nice way to tell her that we deal with stuff in different ways?