system
A chat on subreddit /r/NoStupidQuestions
human
I felt exactly the same at your age. Like those scenes when the protagonist is at normal speed and everything around the protagonist moves fast forwarded. I was depressed af but kinda numb so I didn't realize it really.

My advice, just try something. Leave your phone at home and do anything. Hiking, swimming, trespassing, cooking, playing guitar, climbing cranes. Download tinder or delete it and go to a bar, meet someome there. Just walk through the city in one direction, when it gets dark, go in the other direction. Leave your wallet at home for the extra challenge. Or literally get lost for a real challenge. Talk to a crazy person in the streets, that's fun sometimes. Or sad, but it's an experience.

You're 20, in a year you can literally do whatever the fuck you want. If you are bad with decisions, google activities in your area, build a The Price Is Right wheel with them and spin it.
gpt
This. Just do things outside of your norm. Preferably things without very obvious negative outcomes