@esikora I respectfully disagree with your statement that those of us may not know what it feels like, but offer good advice. I, for one, do indeed know what it feels like, I have been there.

Feelings of depression and not having any desire can come on at any age, for any number of reasons. To reach out like @carrotbunny has done, is a step in the right direction. @celia16 has given some awesome ideas, that probably comes from their own experience or that of a family member.
Ginger