I have lost interest in everything. How do I enjoy life again?

(15M) I used to get excited over the littlest things like going to the mall, hanging out with friends, socializing, wearing a new outfit, etc.

And now all i wanna do is just rot in my bed all day and every social interaction feels fake, forced, and boring. Most conversations i have nowadays last for only a few minutes.

I also used to be a big fashion guy and now i just wear the same thing everyday (Navy hoodie, black sweatpants)

It might sound weird but the only thing i enjoy doing is jacking off tbh