I just found out my closest friend in high school passed away yesterday and I feel absolutely nothing
How long did you know her for?
Around 9 years. We went to grade and high school together.
Not being upset about the death of your friend will make other people think you're a cold, uncaring person. It might be a good idea to think about why you don't feel anything regarding the death of you friend, and see what that says about you.
It's true. I'm just so desensitized to death. It's normal.
Everyone processes death differently and it sounds like you have a unique approach to coping with loss. Don't feel forced to show an emotion unless it is genuine, but you should try to offer your condolences to those that are affected by a death.