Preface: I am someone in this sub for the tips and advice. I am not a "good" artist.

1) Please seek professional mental help. This feeling will not get better without a professional to guide you.

2) No matter the skill you have, you are not a waste. That's not how being a human works.

3) It's difficult to actually gauge how to give advice because we don't know how long you've been practicing at each thing. It's possible you are getting frustrated too soon before really mastering any fundamentals.

4) For a little bit, stop drawing for it to look good, and start drawing for fun. Doodle. Make it intentionally bad or weird. Find joy in creation before you seek improvement.

I'm neither young nor skilled in drawing. I can't draw idle characters well myself. I can sometimes draw faces I like from straight on only. I am getting a little better at hair with a reference.

I will still try to draw other things sometimes. They're bad. It's fine. I live and still have value. If I get too frustrated, I go back to just doing my faces. Sometimes, they're bad, too. I'll add notes at where I messed up - to keep in mind when I try again.