drawing like all skills become honed overtime, criticising such early work is only negative to the development of your potential.
I will say that it's wise to draw on plain people, even for doodling and practises. You may not think it but lines on the paper will subtly effect how you draw. They'll do little to help you as far as frames go, frames for faces are always of a curved nature,
Another thing I'll say is to just mainly focus on doing the head and the face, getting use to drawing the centre of the image. To summerise the best help is to buy a cheap, plain paper pad and just doodle faces, eyes, mouths etc until you feel more comfortabe and you feel you're finding your style. Some people are persistant in doing anime but in practising you might find your own natural style that you're better with isn't stereotypical anime.
Don't be discouraged and goodluck.