jus venting, sorry

I just need to vent rn and idk how to express how im feeling, like, i feel so dead inside and i have 0 motivation to leave my room or talk to anyone, to eat, nd its just come out of nowhere. 2 days ago i was hanging out w my dad, talking to his friends and just walking around different towns, and now im laying in my pitch black room at 10pm realising something is wrong, and instead of talking about it w people in my life, im writing my problems down for anyone to see. Anyway i have a problem and its so hard to fix it when i have no clue what it is. Its literally eating me alive.