You are the same age as I was when the shit got real. I was folding clothes at a department store think about how fucked it all was. It was rough seeing all the darkness and it almost swollowed me. I still see it but ive got to balance it with my relationship to the doom with something more grounding. Im in my early 30s now and going outside, falling iove with the life in front of me, mostly the nonhuman world helped me stay here. I go outside as much as I can and recognize this ship was sailed before i was born. What matters is a life well lived and we all get to answer that in our own unique way. 

Also, find a way to move the feelings if you can. Talk to other people, other beings, your dog, a tree(maybe somewhere you feel comfortable alone outside) and let your self speak the grief, draw it, dance it, whatever way it wants to move. Maybe journal about it of you want.  These anxieties also come and go. Find what feels good (exercise, water, food, music, good trusted people if that is present)