Should I quit art

I just want you all to be honest, I’m 15 and really struggling with art, I’m not happy with any of the work as I can’t draw faces or any anatomy for that matter, I have went to multiple art classes, read lots of books, watched videos, etc, but I am still not happy with it as I think it just looks terrible, I can barely finish some as something will probably go wrong, I won’t no how to fix it, and quit, which is most of the art shown in the images. I want advice, and honesty, please and thanks in advance (Also I’m not looking for upvotes or anything)