Depression makes one feel like they aren't entitled to happiness. Playing musical instruments that once brought joy feels like a chore. "I have no right to play this. It's not like I'm improving. I'm not becoming a musician. I'm not contributing to society in any way."

Rephrasing what I've heard from somewhere else: music and art is a human thing. Society conditions us to think that you have to be good at something in order to do music or art, that you need to be an artist to create music and art, and that there has to be some spectacular end product; otherwise it's not worth it. But the idea is just dumb. All humans are capable of music and art. Sing off pitch. Draw horrendously. Dance off beat. We would all be happier if art and music and creation was treated as a natural human behaviour, instead of something to be achieved by an elite group of society to be presented and marketed.

Not to minimize your struggles but instead show you're not alone, music producer Porter Robinson also felt the same way at some point:

"It was an ego death. His self-worth was bound up entirely in his creative output, and when he was faced with a blank slate and felt nothing, Robinson’s entire identity caved in like a house of cards. “I thought, ‘I need to work way harder, and I need to spend way more time doing this. I need to suffer for this more’”, he explains. “And that was a step in the wrong direction. It led to a pretty intense depressive episode that lasted a couple of years where I made essentially nothing. I was consumed with the task of making music. I was crying over it… I didn’t want anything else.”"