Don't know why

Why is it that I never focus on endings. I know that this semester will end in about a week but I haven't really accepted it yet. I postpone my thoughts and continue through life as if nothing will change. While this is fun for the moment, when it does end it's going to be quite abrupt. Why do I do this? Why don't I prepare myself mentally and emotionally for the endings that are coming. It would make things easier for sure. Marketing sucks.