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I had a similar thing. imho: More than likely you are pushing your feelings away - it's a cognitive style. Try to listen to the physical sensations of everyday life, eating, talking, etc. Possibly get some therapy...

I have derealization so I can relate. But if there is one thing that is guaranteed to invoke an emotional response from me it is music. Usually fleeting, but this probably preserves the potency. Needless to say I love music =)

Anhedonia is the term.

It could be symptom of a range of disorders both mild and serious.

Or possibly Alexithymia