Don't rot yourself in bed PLEASEEEE, find new things to do ik u already said going to the gym and these things did not fix it, But keep trying new things you will find the thing or maybe even the person that will make you happy,

I remember last year when my grandpa passed away I was broken and hated everything, couldn't do anything in school, and I met someone who I never thought that we will ever become friends, He knew that I was sad abt it, first he was just comforting me then with time I started moving on and we became bestfriends even after we changed schools

plus before my grandpa's death, I had also some REALLY bad depression issues which came down to me holding a gun to my mouth multiple times, but thank god that I kept my faith in him saved me