Ah, don't say that. I'm guessing that you're comparing your drawings with master "mangaka"s' out there.
What else can best improve your drawing beside doing mangas? (No coloring! Black & white stuff! ^^) Starts as a hobby as you have fun doing them and before you know it you'll get noticed and find your place in the industry

Or "hell with the industry!" you may say "this way is better!" ^^
Think about the flattering comments like "d00d, j00 r s0 k3w1 FTW!!1!1one!!one1!"
(You're welcome to say "Shut up basione!" anytime though :/)