Look up "anhedonia" lol you'll be pretty damn surprised to find out how accurately is describes what you (and I and many others) are feeling.

If you go to a psychiatrist, they are going to label it depression or major depressive disorder, and give you an SSRI (aka antidepressant). Sometimes these help a bit, but with my experience with a few of them, they absolutely destroy everything that you like about yourself and take away what little you feel is left of "you".

If you're interested in some other approaches to handling it, please feel free to PM me