What can you benefit from art?

You said you depressed right...
...well, draw it!

Why do you draw in the first place, rather than do sudoku or crosswords? I suspect you actually like it. If that's the case, you derive pleasure from it, and that's a benefit.

Plenty of people make a living through drawing.

Don't stop drawing, because it makes you happy. Also, try to look into more than one career in the field of art. Don't limit yourself to just drawing portraits. Maybe consider becoming a cartoonist, or an illustrator for a children's book. Since you enjoy drawing people, maybe you can even become a courtroom sketch artist. I like to draw, too. I never claimed to be the best, or the worst. I don't want to learn about structure. I don't care to, because it's cathartic for me. I like the freedom of not knowing what's technically right, or wrong when it comes to skill. My father was a trained artist. For me, it is just a hobby. I don't care if I don't have the skills to make it a career. I wouldn't even care if some people would laugh at what I draw. They can even tell me I can't draw. I do it for fun, but you on the other hand, seemingly want to start a career in visual arts. Maybe becoming an illustrator, cartoonist, or courtroom sketch artist would benefit you.