You'll never become an artist if:
> you are above 20 y.o. or beyond you'll never be able to become a good artist, the brain neuroplasticity is fucked.
> you are socially inept, your art is never going to resonate with others.
> you haven't started at 12 y.o. or sooner, you'll never become a great artist.

You still want to become an artist? Well, here is what you can do:
1) Trace/use 3D models, almost every professional (manga artist, comic book artist, concept art artist) uses 3D models to sketch characters. Why waste time with gesture when you can just create interesting stories?
2) Be Japanese