Why do people feel this way?

Something about these days feel so dull. Any form of entertainment feels so empty now.

Content on media is just boring now, and there's nothing to do. Sure, you may need to finsih some works like homework or just stacks of task needed to be finished but somehow, even if you do them, you still feel like something is missing. You try to do more things to feel accomplished but even then, it just doesn't work. Cleaning your room, watching movies, reading; They just don't feel the same anymore .

This feeling of emptiness marches within you, and as it continues, its like the emotion spreads throughout your body.

Things you once loved fade away like it was just some phase. 
Everyone of your friends/friend group moving on to new parts of their lives. 

Why is it so easy for things to fly away like that.