I can't cry anymore?

From a very young age I was such a sensitive little girl and I would cry at absolutely everything. My family would always tell me to toughen up so I did. But now I have no emotions. I can only feel sad for other people but when it comes to personal things I feel nothing. Whenever a situation occurs that I should cry, everything just goes numb. And I don't know what to do, so I just act like it never happened and move on with my life. For example I had a cat my whole life and it died two weeks ago at the age of 16. My whole family was in tears and I just sat there, walked away and went back to doing homework. I didn't shed a single tear and still haven't. I want to feel emotions but I can't. And I don't how to fix it. Please help me
I can't cry anymore?
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