What is this state of mind where just don't care about any?

Hello,

I've been experiencing this for a while now where I just don't care about anything. I think 5-6 times a week.If something bad happens or a thing that will make all people go wow. I will just say "Oh". If i get a good grade/award, I feel like it's a waste of time. I could be using this time to do nothing.I just feel so empty inside, I'm not sad. It's just feel everything is nothing.

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Thanks