Is this a sign of depression?

I don't really feel like anything is fun anymore. Watching youtube, watching Netflix, playing video games, I don't wanna talk to people and don't feel like engaging in conversations, etc. All of this half a year ago was super fun to me. I don't have the discipline to do anything, not even basic chores or schoolwork. I dont work in class anymore, because it is so fucking boring.

The only fun thing that I have done for the past months has been listening to music and disappearing into my thoughts for the entire day. 

The thing is I don't feel sad either, I literally feel nothing. I am emotionally numb.

Also wanna note that I have for the past six months been excessively using drugs, ranging from ecstasy, benzos, opioids, stimulants etc.

Is this a sign of depression you think?

\- From an 18 year old boy.